Claude Fable 5.1
- TYPE
- Model
- SIGNALS
- 10
- FIRST SEEN
- Sep 1, 2026
- LAST SEEN
- Sep 21, 2026
Recent signals
- Introducing Claude Opus 5.5 Sep 21, 2026
- OpenAI prices GPT-6 Astra at $10/1M input tokens and $50/1M output tokens, matching Anthropic's pricing for Claude Fable 5.1 (The Deep View) Sep 3, 2026
- Muse Spark 1.3 with max reasoning, in limited preview for partners, scores 62 on the Artificial Analysis Intelligence Index, behind only Fable 5.1 and Opus 5 (@artificialanlys) Sep 2, 2026
- Claude Fable 5.1 made me a really nice animated pelican Sep 1, 2026
- Anthropic says Fable 5.1 "will cost an estimated 25% less than Fable 5 for typical workloads" and up to ~45% less for "highly agentic work" (Zac Hall/9to5Mac) Sep 1, 2026
- Anthropic prices Fable 5.1 at $10/1M input tokens and $50/1M output tokens, unchanged from Fable 5, and cuts cache read pricing by 75% to $0.25/1M tokens (Frederic Lardinois/The New Stack) Sep 1, 2026
- Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work Sep 1, 2026
- Claude Fable 5.1 and Mythos 5.1 are Anthropic's first models to watermark text outputs; a detection API is available to eligible groups as required under EU law (Ben Patterson/PCWorld) Sep 1, 2026
- Anthropic Releases Claude Fable 5.1 and Claude Mythos 5.1: 52.6% on Terminal-Bench-Science and 75% Cheaper Cache Reads Sep 1, 2026
- Anthropic unveils Claude Fable 5.1, which is generally available, and Mythos 5.1, for trusted partners and with cybersecurity and life sciences safeguards (Anthropic) Sep 1, 2026