Type: AI model
Concepts: Code Agents Mentioned alongside: Anthropic Claude Opus 5 Claude Opus 5.5 Claude Sonnet 5 Fable 5.1 Recent briefs: 2026-10-25
Recent Updates
- 2026-09-10: Cognition Releases SWE-2 Coding Model at 64% Lower Cost Than Fable 5.1 (breakingnewsofficial) · cognition.com — Code Agents LLM Evals Cognition SWE-2 · SWE-1.7 SWE-1.72 SWE-1.6 Kimi K33 · Fable 5.1 · GPT-5.6 Sol · GPT-6 Astra · Grok 4.6
- 2026-09-11: Benchmarking RTK terminal compression: claimed 60% token savings don’t materialize in practice (breakingnewsofficial) · quesma.com — Code Agents LLM Evals Agents Anthropic · JetBrains · OpenRouter · DeepSeek V4
- 2026-09-18: Mozilla Releases State of Open Source AI Report on OSS vs Closed LLM Dynamics (breakingnewsofficial) · stateofopensource.ai — Open Source LLMs MCP LLM Evals Mozilla SlashData · OpenRouter · Artificial Analysis · Epoch · METR · DeepSeek · NVIDIA · Hugging Face · Stripe · Qwen · LLaMA
- 2026-09-23: Strands Harness Released as an Open-Source General-Purpose Agent Runtime (breakingnewsofficial) · strandsagents.com — Agents Agent Memory Context Engineering Tool Use MCP Hacker News · Amazon · Anthropic · OpenAI · Google · Cloudflare · Microsoft · Claude · GPT
- 2026-10-25: Timeline and Mechanics of Rapid LLM Price and Cache Cuts Across OpenAI and Anthropic (breakingnewsofficial) · minimaxir.com — Code Agents OpenAI · Anthropic · GPT-5.6 Sol · GPT-5.6 Luna · GPT 5.5 · Terra · Claude Sonnet 5 · Claude Opus 5 · Opus 4.5 · Fable 5.1 · GPT-6 Astra · GPT-6 Sol · GPT-6 Luna · Claude Opus 5.5 · GPT-6.1 Sol
FAQ
What is Fable 5?
Fable 5 is the shorthand for Anthropic’s Claude Fable 5, the publicly available, safety-gated flagship of the fifth Claude generation released June 2026. It tops most benchmarks among generally available models, including roughly 80% on SWE-Bench Pro. GROUNDING tracks Fable 5’s benchmarks, guardrails, and relationship to the partner-only Mythos 5.
What does this page track?
Dated radar mentions, source links, related concepts, and builder-relevant context for Fable 5, collected automatically by GROUNDING.
When was Fable 5 last mentioned?
Fable 5 was most recently mentioned in a radar update dated 2026-10-25.
Category: Text / Language Models