Type: AI model or model family
Claude Fable 5.1 appears in the radar stream as a model or model family. This page is a living index of dated mentions and sources — open Recent Updates and Backlinks for context, not a full product brief.
Recent Updates
- 2026-09-01: Claude Fable 5.1 Released — Agentic AI Model with 1M Context and Reduced Cache Costs (breakingnewsofficial) · platform.claude.com — Agents Code Agents Context Engineering Long Context Anthropic · Amazon · Google · Microsoft · AWS Anton Vdovitchenko Claude Mythos 5.1 · Claude Fable 5 · Claude Opus 5 · Claude Opus 4.8
- 2026-09-01: Claude Fable 5.1 and Mythos 5.1 Released (breakingnewsofficial) · anthropic.com — Anthropic Millennium Claude Mythos 5.1 · Claude Fable 5
- 2026-09-02: Evaluating LLMs for mushroom identification: systematic benchmark of Claude, GPT, Gemini, and GLM on safety-critical species classification (breakingnewsofficial) · quesma.com — LLM Evals OpenAI · Google · Anthropic · GPT-5.6 Sol · Gemini 3.7 Flash · GLM-5.3-Flash
- 2026-09-03: GPT-6 Astra: OpenAI’s New Fable Competitor with Strong Benchmarks and Long-Context Performance (breakingnewsofficial) · simonwillison.net — Long Context OpenAI · AWS · Hugging Face · Meta · Artificial Analysis · GPT-6 Astra · Claude Fable 5 · GPT-5.6 Sol Meta Muse Spark 1.3
- 2026-09-05: Artificial Analysis Intelligence Index v4.2: Agentic Knowledge Work and Document Reasoning Evaluations (breakingnewsofficial) · artificialanalysis.ai — LLM Evals Agents Anthropic · OpenAI · Meta · SpaceXAI · Moonshot · z.ai · Google Surge · GPT-6 Astra · GPT-5.6 Sol · Grok 4.5 · Gemini 3.5 Flash-Lite · Kimi
- 2026-09-07: Building a video compressor tool with Claude Code and WebAssembly FFMPEG (breakingnewsofficial) · simonwillison.net — Anthropic Simon Willison
- 2026-09-10: Cognition SWE-2: 2.8T MoE model claims 92.8 on Terminal-Bench 2.1 at 64% lower cost than Fable 5.1 (breakingnewsofficial) · tokenstead.ai — Code Agents LLM Evals Cognition · Kimi · OpenRouter Tokenstead SWE-2 · Kimi K3 · GPT-6 Astra · SWE-1.7
- 2026-09-11: Datasette security releases with AI-assisted audit using frontier models (breakingnewsofficial) · simonwillison.net — Code Agents Anthropic · OpenAI Simon Willison Sevban Dönmez Alex Garcia · GPT-5.6 · GPT-6 Astra
FAQ
What is Claude Fable 5.1?
Claude Fable 5.1 appears in the radar stream as a model or model family. This page is a living index of dated mentions and sources — open Recent Updates and Backlinks for context, not a full product brief.
What does this page track?
Dated radar mentions, source links, related concepts, and builder-relevant context for Claude Fable 5.1, collected automatically by GROUNDING.
When was Claude Fable 5.1 last mentioned?
Claude Fable 5.1 was most recently mentioned in a radar update dated 2026-09-11.
Category: Text / Language Models