Anthropic
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...
Cost / 1M tokens
Very high usage$10.00
input
$0.25
cached input
$50.00
output
Context Window
1M
Up to 128K max output
Modalities
text, image, file → text
Claude tokenizer
Quickstart & API
anthropic/claude-fable-5.1Best for & Strengths
Key Strengths
Recommended Workloads in ChatOSS
- Large codebases
- Professional development
- Coding agents
Verified Evaluations
Benchmarks & Frontier Comparison
How Claude Fable 5.1 compares against leading open-weight and proprietary frontier models across independent agentic coding and reasoning suites.
| Benchmark (Metric) | Claude Fable 5.1 | DeepSeek V4.1 Flash | GLM 5.3 | Kimi K3.1 Pro | Claude Opus 5.5 |
|---|---|---|---|---|---|
| Agentic & Software Engineering | |||||
| ChatOSS Agentic Coding Index (%) | 67.6% | 63.2% | 58.3% | 65% | 74.1% |
| SWE-Bench Verified (%) | 95% | 91.5% | 95.4% | 94.8% | 97% |
| DeepSWE v1.1 (Pass@1 %) | 67.4% | 77% | 69% | 73.5% | 74.2% |
| Vibe Code Bench v1.1 (%) | 90.26% | 87.7% | 78.1% | 88.4% | 90.3% |
| Terminal-Bench 4.0 (%) | 58.08% | 42.3% | 42% | 46.2% | 65.2% |
| Code Migration (%) | 54.61% | 45.6% | 44.2% | 52% | 66.7% |
| Intelligence & Token Economics | |||||
| Artificial Analysis Intelligence Index (0–100) | 53.4 | 39.5 | 44.8 | 55.1 | 57.6 |
| Input Price (/ 1M tokens) | $10.00 | $0.15 | $1.40 | $2.00 | $4.00 |
| Output Price (/ 1M tokens) | $50.00 | $0.60 | $4.40 | $10.00 | $20.00 |
ChatOSS Agentic Coding Index
ChatOSS Benchmark Audit · 4-benchmark composite mean
SWE-Bench Verified
Vals AI · Terminus 2
DeepSWE v1.1
DeepSWE / Official Audit · Mini-SWE-Agent
Vibe Code Bench v1.1
Vals.ai · OpenHands
Terminal-Bench 4.0
Vals.ai / Artificial Analysis · Terminus 2
Terminal-Bench 2.1
Vals.ai · Terminus 2
Code Migration
Vals.ai · Vals evaluation harness
Artificial Analysis Intelligence Index
Artificial Analysis
Design Arena: FULLSTACK
Design Arena · Rank #1 (57.2% win)
Design Arena: GODOTGAMEDEV
Design Arena · Rank #1 (60.7% win)
Design Arena: HTMLSLIDES
Design Arena · Rank #1 (56.5% win)
Design Arena: MOBILEAPPS
Design Arena · Rank #5 (56.3% win)
Active Provider Endpoints (4)
Upstream inference providers serving Claude Fable 5.1, with per-provider pricing, context limits, quantization, and 24-hour uptime.
| Provider | Input / 1M | Output / 1M | Cache Read / 1M | Context | Max Output | Quantization | Uptime (24h) |
|---|---|---|---|---|---|---|---|
Azure azure | $10.00 | $50.00 | $0.25 | 1M | 128K | — | 100.0% |
Anthropic anthropic | $10.00 | $50.00 | $0.25 | 1M | 128K | — | 100.0% |
Amazon Bedrock amazon-bedrock | $10.00 | $50.00 | $0.25 | 1M | 128K | — | — |
Google google-vertex/global | $10.00 | $50.00 | $0.25 | 1M | 128K | — | 100.0% |
Supported API Parameters
Parameters accepted by this model when called through ChatOSS or OpenRouter.
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