Use OpenAI Models in Big-AGI.

Bring your own key: OpenAI's API rates, no markup. Keys and chats stay in your browser. Run OpenAI in parallel with other models, then compare and merge the answers.

GPT-5.6 Sol
GPT-5.6 Terra
GPT-5.6 Luna

All supported OpenAI models

ModelContextInputOutputReleased

GPT-5.6 Sol

NEW
VisionReasoningTools / functionsWeb searchImage output

Flagship next-generation model. Strongest yet for agentic coding, science, and cybersecurity, with the most robust safety stack to date. 1M token context.

1.1M

$5

$30

Jun 2026

GPT-5.6 Terra

NEW
VisionReasoningTools / functionsWeb searchImage output

Balanced model for efficient, high-volume everyday work. Competitive with GPT-5.5 while being 2x cheaper. 1M token context.

1.1M

$2.5

$15

Jun 2026

GPT-5.6 Luna

NEW
VisionReasoningTools / functionsWeb searchImage output

Fastest, most affordable GPT-5.6 model for high-volume work. Strong capability at the lowest cost in the family. 1M token context.

1.1M

$1

$6

Jun 2026

GPT-5.5

VisionReasoningTools / functionsWeb searchImage output

New baseline for complex production workflows. Stronger task execution, more precise tool use, more efficient reasoning with fewer tokens. 1M token context.

1.1M

$5

$30

Apr 2026

GPT-5.5 Pro

VisionReasoningTools / functionsWeb searchImage output

Most capable model for complex tasks. Uses more compute for smarter, more precise responses on the hardest problems.

1.1M

$30

$180

Apr 2026

GPT-5.4 Mini

VisionReasoningTools / functionsWeb searchImage output

Strongest mini model for coding, computer use, and subagents. GPT-5.4-class intelligence at lower cost and latency.

400K

$0.75

$4.5

Mar 2026

GPT-5.4 Nano

VisionReasoningTools / functionsWeb searchImage output

Cheapest GPT-5.4-class model for simple high-volume tasks like classification and data extraction.

400K

$0.2

$1.25

Mar 2026

GPT-5.4

VisionReasoningTools / functionsWeb searchImage output

Most capable and efficient frontier model for professional work. Native computer use, improved reasoning, coding, and agentic workflows with 1M token context.

1.1M

$2.5

$15

Mar 2026

GPT-5.4 Pro

VisionReasoningTools / functionsWeb searchImage output

Most capable model for complex tasks. Uses more compute for smarter, more precise responses on difficult problems.

1.1M

$30

$180

Mar 2026

GPT-5.3 Instant

deprecated
VisionTools / functionsWeb searchImage output

GPT-5.3 Instant model, previously powering ChatGPT. Replaced by GPT-5.5 Instant.

128K

$1.75

$14

Mar 2026

GPT Audio 1.5

Audio output

Best voice model for audio in, audio out with Chat Completions. Accepts audio inputs and outputs.

128K

$2.5

$10

Feb 2026

GPT-5.3 Codex

VisionReasoningTools / functionsWeb searchImage output

Most capable agentic coding model. Combines frontier coding performance of GPT-5.2-Codex with reasoning and professional knowledge of GPT-5.2. ~25% faster.

400K

$1.75

$14

Feb 2026

GPT-5.2 Codex

deprecated
VisionReasoningTools / functionsWeb searchImage output

GPT-5.2 optimized for long-horizon, agentic coding tasks in Codex or similar environments. Supports low, medium, high, and xhigh reasoning effort settings.

400K

$1.75

$14

Dec 2025

GPT-5.2

VisionReasoningTools / functionsWeb searchImage output

Most capable model for professional work and long-running agents. Improvements in general intelligence, long-context, agentic tool-calling, and vision.

400K

$1.75

$14

Dec 2025

GPT-5.2 Pro

VisionReasoningTools / functionsWeb searchImage output

Smartest and most trustworthy option for difficult questions. Uses more compute for harder thinking on complex domains like programming.

400K

$21

$168

Dec 2025

GPT-5.2 Instant

deprecated
VisionTools / functionsWeb searchImage output

GPT-5.2 Instant model, previously powering ChatGPT. Replaced by GPT-5.5 Instant.

128K

$1.75

$14

Dec 2025

GPT-5.1 Codex Max

deprecated
VisionReasoningTools / functionsWeb searchImage output

Our most intelligent coding model optimized for long-horizon, agentic coding tasks.

400K

$1.25

$10

Nov 2025

GPT-5.1

VisionReasoningTools / functionsWeb searchImage output

The best model for coding and agentic tasks with configurable reasoning effort.

400K

$1.25

$10

Nov 2025

GPT-5.1 Codex Mini

deprecated
VisionReasoningTools / functionsWeb searchImage output

Smaller, faster version of GPT-5.1 Codex for efficient coding tasks.

400K

$0.25

$2

Nov 2025

GPT-5.1 Codex

deprecated
VisionReasoningTools / functionsWeb searchImage output

A version of GPT-5.1 optimized for agentic coding tasks in Codex or similar environments.

400K

$1.25

$10

Nov 2025

GPT-5.1 Instant

deprecated
VisionReasoningTools / functionsWeb searchImage output

GPT-5.1 Instant with adaptive reasoning. More conversational with improved instruction following.

128K

$1.25

$10

Nov 2025

GPT-5 Search API

VisionWeb search

Updated web search model in Chat Completions API. 60% cheaper with domain filtering support.

400K

$1.25

$10

Oct 2025

GPT Audio Mini

Audio output

Cost-efficient audio model. Accepts audio inputs and outputs via Chat Completions REST API.

128K

$0.6

$2.4

Oct 2025

GPT-5 Pro

VisionReasoningTools / functionsWeb searchImage output

Version of GPT-5 that uses more compute to produce smarter and more precise responses. Designed for tough problems.

400K

$15

$120

Oct 2025

GPT-5 Codex

deprecated
VisionReasoningTools / functionsWeb search

A version of GPT-5 optimized for agentic coding in Codex.

400K

$1.25

$10

Sep 2025

GPT Audio

Audio output

First generally available audio model. Accepts audio inputs and outputs, and can be used in the Chat Completions REST API.

128K

$2.5

$10

Aug 2025

GPT-5 Mini

VisionReasoningTools / functionsWeb searchImage output

A faster, more cost-efficient version of GPT-5 for well-defined tasks.

400K

$0.25

$2

Aug 2025

GPT-5 Nano

VisionReasoningTools / functionsWeb searchImage output

Fastest, most cost-efficient version of GPT-5 for summarization and classification tasks.

400K

$0.05

$0.4

Aug 2025

GPT-5

VisionReasoningTools / functionsWeb searchImage output

The best model for coding and agentic tasks across domains.

400K

$1.25

$10

Aug 2025

GPT-5 ChatGPT

deprecated
VisionTools / functionsWeb searchImage output

GPT-5 model used in ChatGPT.

128K

$1.25

$10

Aug 2025

o4 Mini Deep Research

deprecated
VisionReasoningWeb search

Faster, more affordable deep research model for complex, multi-step research tasks.

200K

$2

$8

Jun 2025

o3 Deep Research

deprecated
VisionReasoningWeb search

Our most powerful deep research model for complex, multi-step research tasks.

200K

$10

$40

Jun 2025

o3 Pro

VisionReasoningTools / functionsWeb searchImage output

Version of o3 with more compute for better responses. Provides consistently better answers for complex tasks.

200K

$20

$80

Jun 2025

o3

VisionReasoningTools / functions

A well-rounded and powerful model across domains. Sets a new standard for math, science, coding, and visual reasoning tasks.

200K

$2

$8

Apr 2025

o4 Mini

deprecated
VisionReasoningTools / functions

Latest o4-mini model. Optimized for fast, effective reasoning with exceptionally efficient performance in coding and visual tasks.

200K

$1.1

$4.4

Apr 2025

GPT-4.1 Nano

VisionTools / functions

Fastest, most cost-effective GPT 4.1 model. Delivers exceptional performance with low latency, ideal for tasks like classification or autocompletion.

1M

$0.1

$0.4

Apr 2025

GPT-4.1 Mini

VisionTools / functions

Balanced for intelligence, speed, and cost. Matches or exceeds GPT-4o in intelligence while reducing latency by nearly half and cost by 83%.

1M

$0.4

$1.6

Apr 2025

GPT-4.1

VisionTools / functions

Flagship GPT model for complex tasks. Major improvements on coding, instruction following, and long context with 1M token context window.

1M

$2

$8

Apr 2025

o1 Pro

VisionReasoningTools / functions

A version of o1 with more compute for better responses. Provides consistently better answers for complex tasks.

200K

$150

$600

Mar 2025

GPT-4o Mini Search Preview

deprecated
Web search

Latest snapshot of the GPT-4o Mini model optimized for web search capabilities.

128K

$0.15

$0.6

Mar 2025

GPT-4o Search Preview

deprecated
Web search

Latest snapshot of the GPT-4o model optimized for web search capabilities.

128K

$2.5

$10

Mar 2025

o3 Mini

ReasoningTools / functions

Latest o3-mini model snapshot. High intelligence at the same cost and latency targets of o1-mini. Excels at science, math, and coding tasks.

200K

$1.1

$4.4

Jan 2025

o1

deprecated
VisionReasoningTools / functions

Previous full o-series reasoning model.

200K

$15

$60

Dec 2024

GPT-4o mini

VisionTools / functions

Affordable model for fast, lightweight tasks. GPT-4o Mini is cheaper and more capable than GPT-3.5 Turbo.

128K

$0.15

$0.6

Jul 2024

GPT-4o

VisionTools / functions

Snapshot of gpt-4o from November 20th, 2024.

128K

$2.5

$10

May 2024

GPT-4 Turbo

VisionTools / functions

GPT-4 Turbo with Vision model. Vision requests can now use JSON mode and function calling. gpt-4-turbo currently

128K

$10

$30

Apr 2024

3.5-Turbo

Tools / functions

The latest GPT-3.5 Turbo model with higher accuracy at responding in requested formats.

16K

$0.5

$1.5

Jan 2024

3.5-Turbo

deprecated
Tools / functions

The latest GPT-3.5 Turbo model with higher accuracy at responding in requested formats.

16K

$0.5

$1.5

Jan 2024

3.5-Turbo

deprecated
Tools / functions

GPT-3.5 Turbo model with improved instruction following, JSON mode, reproducible outputs, parallel function calling, and more.

16K

$1

$2

Nov 2023

GPT-4

deprecated
Tools / functions

Snapshot of gpt-4 from June 13th 2023 with improved function calling support. Data up to Sep 2021.

8K

$30

$60

Jun 2023

GPT-4

Tools / functions

Snapshot of gpt-4 from June 13th 2023 with improved function calling support. Data up to Sep 2021.

8K

$30

$60

Jun 2023

GPT-5.6 Sol

NEW
Jun 2026

Flagship next-generation model. Strongest yet for agentic coding, science, and cybersecurity, with the most robust safety stack to date. 1M token context.

VisionReasoningTools / functionsWeb searchImage output
1.1M · in $5 · out $30

GPT-5.6 Terra

NEW
Jun 2026

Balanced model for efficient, high-volume everyday work. Competitive with GPT-5.5 while being 2x cheaper. 1M token context.

VisionReasoningTools / functionsWeb searchImage output
1.1M · in $2.5 · out $15

GPT-5.6 Luna

NEW
Jun 2026

Fastest, most affordable GPT-5.6 model for high-volume work. Strong capability at the lowest cost in the family. 1M token context.

VisionReasoningTools / functionsWeb searchImage output
1.1M · in $1 · out $6

GPT-5.5

Apr 2026

New baseline for complex production workflows. Stronger task execution, more precise tool use, more efficient reasoning with fewer tokens. 1M token context.

VisionReasoningTools / functionsWeb searchImage output
1.1M · in $5 · out $30

GPT-5.5 Pro

Apr 2026

Most capable model for complex tasks. Uses more compute for smarter, more precise responses on the hardest problems.

VisionReasoningTools / functionsWeb searchImage output
1.1M · in $30 · out $180

GPT-5.4 Mini

Mar 2026

Strongest mini model for coding, computer use, and subagents. GPT-5.4-class intelligence at lower cost and latency.

VisionReasoningTools / functionsWeb searchImage output
400K · in $0.75 · out $4.5

GPT-5.4 Nano

Mar 2026

Cheapest GPT-5.4-class model for simple high-volume tasks like classification and data extraction.

VisionReasoningTools / functionsWeb searchImage output
400K · in $0.2 · out $1.25

GPT-5.4

Mar 2026

Most capable and efficient frontier model for professional work. Native computer use, improved reasoning, coding, and agentic workflows with 1M token context.

VisionReasoningTools / functionsWeb searchImage output
1.1M · in $2.5 · out $15

GPT-5.4 Pro

Mar 2026

Most capable model for complex tasks. Uses more compute for smarter, more precise responses on difficult problems.

VisionReasoningTools / functionsWeb searchImage output
1.1M · in $30 · out $180

GPT-5.3 Instant

deprecated
Mar 2026

GPT-5.3 Instant model, previously powering ChatGPT. Replaced by GPT-5.5 Instant.

VisionTools / functionsWeb searchImage output
128K · in $1.75 · out $14

GPT Audio 1.5

Feb 2026

Best voice model for audio in, audio out with Chat Completions. Accepts audio inputs and outputs.

Audio output
128K · in $2.5 · out $10

GPT-5.3 Codex

Feb 2026

Most capable agentic coding model. Combines frontier coding performance of GPT-5.2-Codex with reasoning and professional knowledge of GPT-5.2. ~25% faster.

VisionReasoningTools / functionsWeb searchImage output
400K · in $1.75 · out $14

GPT-5.2 Codex

deprecated
Dec 2025

GPT-5.2 optimized for long-horizon, agentic coding tasks in Codex or similar environments. Supports low, medium, high, and xhigh reasoning effort settings.

VisionReasoningTools / functionsWeb searchImage output
400K · in $1.75 · out $14

GPT-5.2

Dec 2025

Most capable model for professional work and long-running agents. Improvements in general intelligence, long-context, agentic tool-calling, and vision.

VisionReasoningTools / functionsWeb searchImage output
400K · in $1.75 · out $14

GPT-5.2 Pro

Dec 2025

Smartest and most trustworthy option for difficult questions. Uses more compute for harder thinking on complex domains like programming.

VisionReasoningTools / functionsWeb searchImage output
400K · in $21 · out $168

GPT-5.2 Instant

deprecated
Dec 2025

GPT-5.2 Instant model, previously powering ChatGPT. Replaced by GPT-5.5 Instant.

VisionTools / functionsWeb searchImage output
128K · in $1.75 · out $14

GPT-5.1 Codex Max

deprecated
Nov 2025

Our most intelligent coding model optimized for long-horizon, agentic coding tasks.

VisionReasoningTools / functionsWeb searchImage output
400K · in $1.25 · out $10

GPT-5.1

Nov 2025

The best model for coding and agentic tasks with configurable reasoning effort.

VisionReasoningTools / functionsWeb searchImage output
400K · in $1.25 · out $10

GPT-5.1 Codex Mini

deprecated
Nov 2025

Smaller, faster version of GPT-5.1 Codex for efficient coding tasks.

VisionReasoningTools / functionsWeb searchImage output
400K · in $0.25 · out $2

GPT-5.1 Codex

deprecated
Nov 2025

A version of GPT-5.1 optimized for agentic coding tasks in Codex or similar environments.

VisionReasoningTools / functionsWeb searchImage output
400K · in $1.25 · out $10

GPT-5.1 Instant

deprecated
Nov 2025

GPT-5.1 Instant with adaptive reasoning. More conversational with improved instruction following.

VisionReasoningTools / functionsWeb searchImage output
128K · in $1.25 · out $10

GPT-5 Search API

Oct 2025

Updated web search model in Chat Completions API. 60% cheaper with domain filtering support.

VisionWeb search
400K · in $1.25 · out $10

GPT Audio Mini

Oct 2025

Cost-efficient audio model. Accepts audio inputs and outputs via Chat Completions REST API.

Audio output
128K · in $0.6 · out $2.4

GPT-5 Pro

Oct 2025

Version of GPT-5 that uses more compute to produce smarter and more precise responses. Designed for tough problems.

VisionReasoningTools / functionsWeb searchImage output
400K · in $15 · out $120

GPT-5 Codex

deprecated
Sep 2025

A version of GPT-5 optimized for agentic coding in Codex.

VisionReasoningTools / functionsWeb search
400K · in $1.25 · out $10

GPT Audio

Aug 2025

First generally available audio model. Accepts audio inputs and outputs, and can be used in the Chat Completions REST API.

Audio output
128K · in $2.5 · out $10

GPT-5 Mini

Aug 2025

A faster, more cost-efficient version of GPT-5 for well-defined tasks.

VisionReasoningTools / functionsWeb searchImage output
400K · in $0.25 · out $2

GPT-5 Nano

Aug 2025

Fastest, most cost-efficient version of GPT-5 for summarization and classification tasks.

VisionReasoningTools / functionsWeb searchImage output
400K · in $0.05 · out $0.4

GPT-5

Aug 2025

The best model for coding and agentic tasks across domains.

VisionReasoningTools / functionsWeb searchImage output
400K · in $1.25 · out $10

GPT-5 ChatGPT

deprecated
Aug 2025

GPT-5 model used in ChatGPT.

VisionTools / functionsWeb searchImage output
128K · in $1.25 · out $10

o4 Mini Deep Research

deprecated
Jun 2025

Faster, more affordable deep research model for complex, multi-step research tasks.

VisionReasoningWeb search
200K · in $2 · out $8

o3 Deep Research

deprecated
Jun 2025

Our most powerful deep research model for complex, multi-step research tasks.

VisionReasoningWeb search
200K · in $10 · out $40

o3 Pro

Jun 2025

Version of o3 with more compute for better responses. Provides consistently better answers for complex tasks.

VisionReasoningTools / functionsWeb searchImage output
200K · in $20 · out $80

o3

Apr 2025

A well-rounded and powerful model across domains. Sets a new standard for math, science, coding, and visual reasoning tasks.

VisionReasoningTools / functions
200K · in $2 · out $8

o4 Mini

deprecated
Apr 2025

Latest o4-mini model. Optimized for fast, effective reasoning with exceptionally efficient performance in coding and visual tasks.

VisionReasoningTools / functions
200K · in $1.1 · out $4.4

GPT-4.1 Nano

Apr 2025

Fastest, most cost-effective GPT 4.1 model. Delivers exceptional performance with low latency, ideal for tasks like classification or autocompletion.

VisionTools / functions
1M · in $0.1 · out $0.4

GPT-4.1 Mini

Apr 2025

Balanced for intelligence, speed, and cost. Matches or exceeds GPT-4o in intelligence while reducing latency by nearly half and cost by 83%.

VisionTools / functions
1M · in $0.4 · out $1.6

GPT-4.1

Apr 2025

Flagship GPT model for complex tasks. Major improvements on coding, instruction following, and long context with 1M token context window.

VisionTools / functions
1M · in $2 · out $8

o1 Pro

Mar 2025

A version of o1 with more compute for better responses. Provides consistently better answers for complex tasks.

VisionReasoningTools / functions
200K · in $150 · out $600

GPT-4o Mini Search Preview

deprecated
Mar 2025

Latest snapshot of the GPT-4o Mini model optimized for web search capabilities.

Web search
128K · in $0.15 · out $0.6

GPT-4o Search Preview

deprecated
Mar 2025

Latest snapshot of the GPT-4o model optimized for web search capabilities.

Web search
128K · in $2.5 · out $10

o3 Mini

Jan 2025

Latest o3-mini model snapshot. High intelligence at the same cost and latency targets of o1-mini. Excels at science, math, and coding tasks.

ReasoningTools / functions
200K · in $1.1 · out $4.4

o1

deprecated
Dec 2024

Previous full o-series reasoning model.

VisionReasoningTools / functions
200K · in $15 · out $60

GPT-4o mini

Jul 2024

Affordable model for fast, lightweight tasks. GPT-4o Mini is cheaper and more capable than GPT-3.5 Turbo.

VisionTools / functions
128K · in $0.15 · out $0.6

GPT-4o

May 2024

Snapshot of gpt-4o from November 20th, 2024.

VisionTools / functions
128K · in $2.5 · out $10

GPT-4 Turbo

Apr 2024

GPT-4 Turbo with Vision model. Vision requests can now use JSON mode and function calling. gpt-4-turbo currently

VisionTools / functions
128K · in $10 · out $30

3.5-Turbo

Jan 2024

The latest GPT-3.5 Turbo model with higher accuracy at responding in requested formats.

Tools / functions
16K · in $0.5 · out $1.5

3.5-Turbo

deprecated
Jan 2024

The latest GPT-3.5 Turbo model with higher accuracy at responding in requested formats.

Tools / functions
16K · in $0.5 · out $1.5

3.5-Turbo

deprecated
Nov 2023

GPT-3.5 Turbo model with improved instruction following, JSON mode, reproducible outputs, parallel function calling, and more.

Tools / functions
16K · in $1 · out $2

GPT-4

deprecated
Jun 2023

Snapshot of gpt-4 from June 13th 2023 with improved function calling support. Data up to Sep 2021.

Tools / functions
8K · in $30 · out $60

GPT-4

Jun 2023

Snapshot of gpt-4 from June 13th 2023 with improved function calling support. Data up to Sep 2021.

Tools / functions
8K · in $30 · out $60
51 models · sorted by release date · prices in USD per 1M tokens · refreshed every 30 minutesCompare every model across vendors →

Get started in 3 steps

1

Create an API key at the OpenAI console.

2

Paste it into Big-AGI's model settings.

3

Start chatting, or Beam it against other models and fuse the answers.

Running OpenAI in Big-AGI

Add your OpenAI API key and use OpenAI's models at OpenAI's own API rates. Big-AGI isn't a reseller: no markup and no intermediary, so the bill comes straight from OpenAI to your account.

  • Your key, your billing. Usage is billed by OpenAI directly, nothing routes through us.
  • Reasoning effort and verbosity. Set both per request, low through high, so you tune depth and length instead of accepting a default.
  • Function calling and structured outputs. JSON-schema responses your code can parse without cleanup.
  • Hosted tools, tuned not guessed. Web search takes an adjustable context size and geolocation, and image generation and editing runs a real GPT Image pipeline with mask-based edits.

Why not just ChatGPT?

ChatGPT gives you one model in one box. Big-AGI runs OpenAI's models next to Claude, Gemini, Grok, and anything else you've connected, in the same conversation, something ChatGPT has no reason to offer.

It also hands you the dials ChatGPT hides: reasoning effort and verbosity are real parameters on OpenAI's API, not settings we invented. Your keys stay in your browser, not inside an OpenAI account. Big-AGI itself needs no account either, paste a key and start.

OpenAI bills per token too, so a light user can spend less in a month than a flat subscription, and a heavy user never hits an artificial cap, just a bill for tokens used. Beam parallel runs cost more tokens than a single ChatGPT reply, the honest tradeoff for comparing frontier models side by side.

Your keys and your data

Turn on Direct Connection under OpenAI's Advanced settings and the browser calls OpenAI directly, skipping the Big-AGI server, whenever your key lives client-side and OpenAI's API allows it. Your keys stay in your browser. Chats are stored locally first and sync only if you turn it on. The AI Inspector shows the exact request before it goes out: model, parameters, token counts, and a cost estimate.

OpenAI in Beam

Beam runs OpenAI's models against Claude, Gemini, or any other model you've connected, in parallel, then hands you Fusions: several strategies that combine, cross-check, and synthesize the parallel answers, which beats just picking the best one. Parallel runs use more tokens than a single chat.

Bring your OpenAI key. Keep control.

Your key, your data, your choice of model. Big-AGI is open source and self-hostable, so you can check exactly how OpenAI is called.

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