Use Anthropic Models in Big-AGI.
Bring your own Anthropic key and use Anthropic at its own API rates, with no markup. Keys and chats stay in your browser. Run Anthropic in parallel with other models, then compare and merge the answers.
Running Anthropic in Big-AGI
Add your Anthropic API key and use Claude models at Anthropic's own API rates. Big-AGI adds no markup and keeps your keys and chats in your browser, not on its servers.
- Your key, your billing. Usage is billed by Anthropic to your account. Big-AGI does not meter or charge for model usage.
- Direct Connection. Turn it on and the browser calls Anthropic directly, bypassing the Big-AGI server, when your key is client-side and Anthropic allows it.
- Extended thinking and tools. Use Claude's extended reasoning, tool use, and vision, with prompt caching to cut the cost of repeated context.
- Beam. Run Claude in parallel with other models, then compare or merge the answers. Parallel runs use more tokens than a single chat.
All supported Anthropic models
Claude Fable 5
NEWMost capable widely released model for the most demanding reasoning and long-horizon agentic work
1M
$10
$50
Jun 2026
Claude Opus 4.8
NEWMost capable Opus-tier model for complex reasoning and agentic coding
1M
$5
$25
May 2026
Claude Opus 4.7
Previous most capable model for complex reasoning and agentic coding
1M
$5
$25
Apr 2026
Claude Sonnet 4.6
Best combination of speed and intelligence for everyday tasks
1M
$3
$15
Feb 2026
Claude Opus 4.6
Previous most intelligent model for complex agents and coding, with adaptive thinking
1M
$5
$25
Feb 2026
Claude Opus 4.5
Previous most intelligent model with advanced reasoning for complex agentic workflows
200K
$5
$25
Nov 2025
Claude Haiku 4.5
Fastest model with exceptional speed and performance
200K
$1
$5
Oct 2025
Claude Sonnet 4.5
Previous best combination of speed and intelligence for complex agents and coding
200K
$3
$15
Sep 2025
Claude Opus 4.1
deprecatedPrevious Opus model. Deprecated June 5, 2026, retiring August 5, 2026.
200K
$15
$75
Aug 2025
Claude Fable 5
NEWMost capable widely released model for the most demanding reasoning and long-horizon agentic work
Claude Opus 4.8
NEWMost capable Opus-tier model for complex reasoning and agentic coding
Claude Opus 4.7
Previous most capable model for complex reasoning and agentic coding
Claude Sonnet 4.6
Best combination of speed and intelligence for everyday tasks
Claude Opus 4.6
Previous most intelligent model for complex agents and coding, with adaptive thinking
Claude Opus 4.5
Previous most intelligent model with advanced reasoning for complex agentic workflows
Claude Haiku 4.5
Fastest model with exceptional speed and performance
Claude Sonnet 4.5
Previous best combination of speed and intelligence for complex agents and coding
Claude Opus 4.1
deprecatedPrevious Opus model. Deprecated June 5, 2026, retiring August 5, 2026.
Bring your Anthropic 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 Anthropic is called.
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