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Tools2026-09-03 · source-backed
Released September 3, v2.38.0 adds context_window to ModelProfile and context_window_used to RunContext (#4611), giving agent code a first-party way to read remaining context instead of estimating from token counts. It also adds a VLLMProvider for self-hosted vLLM servers, Claude Fable 5.1 and Mythos 5.1, gemini-3.8-flash, and typed CustomEvent/CapabilityEvent emission with an @on_event subscriber. Notable bug fix: CodeExecutionTool uploads were never reaching a fresh Anthropic container on multi-turn history.
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Anthropic released Claude Fable 5.1 on September 1. Claude Code v2.1.257 made it the default Fable model at 17:53 UTC that day, with a 1M-token context window, $10 per million input tokens, $50 per million output, and $0.25 per million on cache reads (claude-code CHANGELOG). B...
After a June 12 US export-control order pulled Fable 5 and Mythos 5 offline for nearly three weeks, Anthropic brought Fable 5 back once the order lifted. The order followed an Amazon report that Fable 5's safeguards could be bypassed to surface software vulnerabilities. Anthro...
On June 9, Anthropic released Claude Fable 5 and Mythos 5 across Claude.ai, Claude Code (CLI and web), and Cowork. The spec sheet: 1M-token context, 128K max output, a January 2026 knowledge cutoff, and pricing at $10 input / $50 output per million tokens. That's double Opus 4...
Version 2.20.0 stops a bare McpError from an MCP server killing the whole run, which is the difference between one flaky server aborting your agent and the agent routing around it. It also replays tool-search history across provider boundaries instead of dropping it, which mat...
A single PR title. A hidden HTML comment in an issue body. No jailbreak, no social engineering, no user interaction required. Your credentials get exfiltrated through GitHub's own infrastructure before you ever see the notification. Security researcher Aonan Guan (Wyze Labs) a...
Day 9 of the blackout, and the reporting finally caught up to the politics. According to Tom's Hardware, the export-control shutdown of Claude Fable 5 and Mythos 5 wasn't a cold bureaucratic move. White House AI adviser David Sacks says the administration asked Dario Amodei to...
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