13 posts tagged with "anthropic"

LiteLLM now supports Claude Sonnet 5.5 on Day 0. Use it across Anthropic, Bedrock, Gemini Enterprise Agent Platform, and Azure through the LiteLLM AI Gateway, with spend, rate limits, and logging in one place.

LiteLLM now supports Claude Opus 5.5 on Day 0. Use it across Anthropic, Bedrock, Gemini Enterprise Agent Platform, and Azure through the LiteLLM AI Gateway. Call it with the same OpenAI-compatible request you already use, and track spend, rate limits, and logging in one place.

Last Updated: September 21, 2026

Anthropic is moving Claude Code auto mode's safety classifier from the client to the Claude API. Starting with Claude Code v2.1.278, released September 19, sessions on Enterprise plans and Claude API accounts ask the server to run those checks as part of their own model requests, and Anthropic does not charge for the checks when the server performs them. Anthropic told us the rollout started on September 18 and is gradual, beginning with the Claude Code CLI and VS Code extension and followed by the desktop app and Claude Code on the web over the following week, and that on September 25 auto mode becomes the default permission mode in Claude Code. Today the built-in default is auto on Pro, Max and Team plans and Manual on Enterprise plans and Claude API keys, the accounts that typically sit behind a gateway, per Anthropic's permission modes reference.

Server-side auto mode depends on a contract between Claude Code and the API that some gateways did not preserve, LiteLLM included. The fix is merged on main and ships in the dev release cut on Tuesday, September 22, then in the release candidate cut on Saturday, September 26 and the stable release planned for Saturday, October 3. This post explains what Claude Code needs from an AI Gateway, what LiteLLM was doing wrong, what changed, which release carries it, and how to confirm your deployment is ready.

LiteLLM supports Claude Fable 5.1 on Day 0 across Anthropic, Bedrock, Gemini Enterprise Agent Platform, and Azure, with spend, rate limits, fallbacks, and logging in one place.

LiteLLM now supports Claude Opus 5 on Day 0. Use it across Anthropic, Azure, Vertex AI, and Bedrock through the LiteLLM AI Gateway. Call it with the same OpenAI-compatible request you already use, and track spend, rate limits, and logging in one place.

LiteLLM now supports Claude Sonnet 5 on Day 0. Use it across Anthropic, Azure, Vertex AI, and Bedrock through the LiteLLM AI Gateway. Call it with the same OpenAI-compatible request you already use, and track spend, rate limits, and logging in one place.

LiteLLM now supports Claude Fable 5 on Day 0. Use it across Anthropic, Azure, Vertex AI, and Bedrock through the LiteLLM AI Gateway. Call it with the same OpenAI-compatible request you already use, and track spend, rate limits, and logging in one place.

LiteLLM now supports Claude Opus 4.8 on Day 0. Use it across Anthropic, Azure, Vertex AI, and Bedrock through the LiteLLM AI Gateway. Call it with the same OpenAI-compatible request you already use, and track spend, rate limits, and logging in one place.

LiteLLM now supports Claude Opus 4.7 on Day 0. Use it across Anthropic, Azure, Vertex AI, and Bedrock through the LiteLLM AI Gateway.

LiteLLM now supports Claude Sonnet 4.6 on Day 0. Use it across Anthropic, Azure, Vertex AI, and Bedrock through the LiteLLM AI Gateway.

Date: February 13, 2026 Duration: ~3 hours Severity: High Status: Resolved

Note: This fix will be available starting from v1.81.13-nightly or higher of LiteLLM.

Summary​

Claude Code began sending unsupported Anthropic beta headers to non-Anthropic providers (Bedrock, Azure AI, Vertex AI), causing invalid beta flag errors. LiteLLM was forwarding all beta headers without provider-specific validation. Users experienced request failures when routing Claude Code requests through LiteLLM to these providers.

• LLM calls to Anthropic: No impact.
• LLM calls to Bedrock/Azure/Vertex: Failed with invalid beta flag errors when unsupported headers were present.
• Cost tracking and routing: No impact.

LiteLLM now supports Claude Opus 4.6 on Day 0. Use it across Anthropic, Azure, Vertex AI, and Bedrock through the LiteLLM AI Gateway.

This guide covers Anthropic's latest model (Claude Opus 4.5) and its advanced features now available in LiteLLM: Tool Search, Programmatic Tool Calling, Tool Input Examples, and the Effort Parameter.