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Public story · 2026-03-21 · source-backed
Anthropic moved the 1M token context window to general availability for Opus 4.6 and Sonnet 4.6 at standard pricing. Auto-activates for requests over 200K tokens. Media limit increased from 100 to 600 images/PDFs per request. The new thinking.display: 'omitted' flag for streaming extended thinking without surfacing reasoning blocks reduces bandwidth for agentic callers. Quietly removes one of the biggest friction points for long-document and multi-file workflows.
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Anthropic confirmed general availability of 1M context for Opus 4.6 and Sonnet 4.6 at standard pricing — a 900K-token request billed at the same rate as 9K. Opus scores 78.3% on MRCR v2 (highest among frontier models at that length). Media handling expanded 6x to 600 images or...
The Compaction API enables server-side context summarization for effectively infinite conversations without context limits, available on Opus 4.6. MCP servers can now request structured input mid-task — interactive dialogs with text fields, dropdowns, and checkboxes — via new...
A solo Claude Opus 4.5 agent spent $9 and 20 minutes building a retro game. It was broken. The same model, wrapped in Anthropic's multi-agent harness, spent $200 over 6 hours and produced a fully playable game with physics, sprite editors, and AI integration. Anthropic's engin...
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...
Fable 5.1 writes short progress updates between tool calls, each arriving as its own thinking block, but under the default omitted those come back empty and a long turn looks silent to users (Anthropic). The new option (beta header thinking-display-updates-2026-08-18) returns...
Released the same day, adding claude-fable-5, claude-sonnet-5 and claude-opus-5 plus WebSearch, WebFetch, CodeExecution and AnthropicMCP. Requires llm>=0.32. Extended-thinking config collapsed to thinking and thinking_effort, dropping thinking_budget, thinking_display and thin...
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