Anthropic · Released Sep 1, 2026
Claude Fable 5.1
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
- #1OTIS Mock AIME
- Top 2%SciCode
- #1ProofBench
- Top 3%LMCA
- Released
- Sep 1 2026
- Context window
- 1M 128K out
- Input / 1M tokens
- $10.00
- Output / 1M tokens
- $50.00
Where to run it
38 providers compared
Included in GitLab Duo. Cheapest: Azure, Anthropic, Google +31 more at $10.00 / $50.00 per 1M input / output tokens — 23% less than the priciest option.
| Provider | Input | Output | Cache read | Context | Max output | Uptime | vs. best |
|---|---|---|---|---|---|---|---|
| GitLab Duosubscription plan | Plan | Plan | Plan | 1M | 128K | — | Plan |
| Azure | $10.00 | $50.00 | $0.25 | 1M | 128K | 100%24h | Cheapest |
| Anthropic | $10.00 | $50.00 | $0.25 | 1M | 128K | 100%24h | Cheapest |
| Googleglobal | $10.00 | $50.00 | $0.25 | 1M | 128K | 99.3%24h | Cheapest |
| Amazon Bedrock | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| NanoGPT | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Cloudflare AI Gateway | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Venice AI | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Boundless | $10.00 | $50.00 | $0.25 | 262K | 128K | — | Cheapest |
| Kilo Gateway | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Vercel AI Gateway | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| LLM Gateway | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| 302.AI | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| DigitalOcean | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| ZenMux | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| GitHub Copilot | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Perplexity Agent | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Vertex | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Aixy | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Prime Inference | $10.00 | $50.00 | — | 1M | 128K | — | Cheapest |
| Neon | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Azure Cognitive Services | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Vivgrid | $10.00 | $50.00 | $0.50 | 1M | 128K | — | Cheapest |
| CrossModel | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Tempr Gateway | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| DevPass (LLM Gateway) | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| CommandCode | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Merge Gateway | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Ofox | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| OpenCode | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| NEAR AI Cloud | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Vertex (Anthropic) | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Eden AI | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Opper | $10.00 | $50.00 | $0.25 | 1M | 128K | — | Cheapest |
| Standard Compute | $10.00 | $50.00 | $0.25 | 1M | 50K | — | Cheapest |
| Requesty | $11.00 | $55.00 | $0.28 | 1M | 128K | — | +10% |
| AIHubMix | $11.00 | $55.00 | $0.28 | 1M | 128K | — | +10% |
| AI/ML API | $13.00 | $65.00 | $0.33 | 1M | 128K | — | +30% |
Value
Price vs. performance
Claude Fable 5.1 Other Anthropic Other labs Value frontier · FrontierSWE vs. input price per 1M tokens (log scale) · Drag to pan, pinch or Ctrl + scroll to zoom, double-click to zoom in.
Benchmarks
25 benchmark scores
| Benchmark | Score | Rank | Leader |
|---|---|---|---|
| FrontierSWESoftware engineering · Ultra-long-horizon engineering tasks with a 20-hour budget each | 56.3% | #4of 19 | GPT-6 Astra65.5% |
| CursorBenchSoftware engineering · Ambiguous multi-file tasks drawn from real Cursor sessions | 51.8% | #4of 16 | Claude Opus 5.557.8% |
| FrontierCodeSoftware engineering · Mergeable fixes for hard open-source issues | 50.9% | #6of 41 | Claude Opus 5.554.6% |
| MirrorCodeSoftware engineering · Reimplement whole programs end-to-end without the source | 73.3% | #2of 10 | Claude Opus 5.577.4% |
| GSOSoftware engineering · Optimize real code to make it significantly faster | 88.2% | #1of 27 | This model |
| SciCodeSoftware engineering · Research-coding problems from the natural sciences | 63.1% | #2of 102 | Claude Opus 5.566.9% |
| WeirdML v3Software engineering · Unfamiliar ML and data tasks with vague goals | 26.0% | #4of 22 | GPT-6 Astra42.2% |
| APEX-AgentsAgents & computer use · Long professional tasks in banking, consulting and law | 68.6% | #4of 51 | Gemini 4 Argon82.4% |
| Remote Labor IndexAgents & computer use · Real paid freelance projects done end-to-end | 17.9% | #3of 13 | Claude Opus 5.521.3% |
| Vending-Bench 2Agents & computer use · Run a simulated vending business for a year (final balance) | $5,422 | #25of 61 | GPT-6 Astra$15,515 |
| GDP.pdfWriting & content · Answer questions about real professional PDFs | 29.6% | #7of 38 | GPT-6.1 Sol35.0% |
| SimpleQA VerifiedWriting & content · Factual accuracy on 1,000 short questions | 70.8% | #6of 79 | Gemini 4 Argon76.0% |
| WebDev ArenaDesign & visual · People vote on which model builds the better website (Elo) | 1758 | #5of 90 | Claude Opus 5.51820 |
| Blueprint-Bench 2Design & visual · Turn apartment photos into 2D floor plans | 41.9% | #4of 32 | Gemini 4 Argon54.4% |
| Furniture AssemblyDesign & visual · Spot mistakes in photos of IKEA builds | 70.0% | #6of 34 | Claude Opus 5.583.3% |
| Humanity's Last ExamReasoning & knowledge · Expert questions across 100+ subjects | 46.5% | #2of 32 | GPT-6 Astra54.8% |
| ARC-AGI-2Reasoning & knowledge · Few-shot abstract reasoning on grid puzzles | 90.0% | #7of 75 | GPT-6 Astra95.0% |
| ARC-AGI-1Reasoning & knowledge · Pattern induction from input–output examples | 97.5% | #8of 75 | Gemini 4 Argon98.5% |
| CritPtReasoning & knowledge · Open-ended, research-level physics problems | 31.1% | #6of 111 | GPT-5.6 Sol32.3% |
| Chess PuzzlesReasoning & knowledge · Find the single best move in 100 new puzzles | 48.0% | #17of 83 | GPT-6 Astra76.0% |
| LMCAReasoning & knowledge · Judge the quality of conceptual arguments like experts | 65.5% | #3of 123 | Claude Sonnet 5.568.3% |
| FrontierMathMaths · Expert-written problems, undergrad to early research (tiers 1–3) | 90.2% | #4of 87 | GPT-6.1 Sol93.7% |
| FrontierMath Tier 4Maths · Exceptionally hard research-level problems | 87.8% | #6of 64 | GPT-6.1 Sol100.0% |
| ProofBenchMaths · Graduate maths proofs verified in Lean 4 | 100.0% | #1of 70 | Claude Sonnet 5.5100.0% |
| OTIS Mock AIMEMaths · Competition-style problems harder than MATH Level 5 | 100.0% | #1of 120 | Gemini 4 Argon100.0% |
Specs
Details
- Model ID
anthropic/claude-fable-5.1- Developer
- Anthropic
- Release date
- Sep 1, 2026 ·
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- API price
- $10.00 / $50.00 per 1M input / output tokens
- Providers
- 38
- Input types
- text, image, file
- Reasoning
- Yes
- Tool calling
- Yes
- Open weights
- No
- Free tier
- No
Release date and prices from OpenRouter's catalog; providers from OpenRouter and models.dev. Buying directly from a provider can cost a little differently. Speed, latency and uptime are measured on OpenRouter only; uptime is the share of OpenRouter requests each provider served over the last day. Benchmark scores are the best result per benchmark from Epoch AI, licensed CC BY 4.0. Rank counts every model tracked here with a score.