Claude Fable 5 vs 
Step 5
Both are SOTA right now. Each row below is one board’s call on the two, and the marked figure is the one that board places higher. No row is added to another, so there is no overall winner: the boards measure different things, and where they split, that is the finding.
| Board | Claude Fable 5 | Step 5 |
|---|---|---|
| Artificial Analysis LLM Leaderboard Artificial Analysis Intelligence Index | 49.6 No. 8 of 372 | 43.7 No. 17 of 372 |
| Arena — Agent Overall | 0.082 No. 8 of 49 | 0.005 No. 31 of 49 |
| HarnessTax — SWE-bench Lite SWE-bench Lite | 97.8% No. 1 of 7 | — |
| HarnessTax — Terminal-Bench 2.0 Terminal-Bench 2.0 | 75.6% No. 3 of 7 | — |
| Arena — Code Overall | 1625 No. 18 of 109 | 1570 No. 33 of 109 |
| Arena — Text Overall (style control) | 1504 No. 3 of 306 | 1454 No. 74 of 306 |
| Arena — Vision Overall (style control) | 1309 No. 1 of 128 | 1260 No. 45 of 128 |
Each rank is the board’s own: the rank it publishes, or its place in its own order where it publishes none. The bar is how much of that board the model is ahead of. Scores from different boards cannot be compared.
At a glance
| Developer | Anthropic | StepFun |
|---|---|---|
| Weights | closed | closed |
| Released | 2026-06-09 | — |
| Price Blended Price, USD per 1M tokens (3:1 input:output) | $20.00 | $1.43 |
| Value: where it sits on the kill line | SOTA | SOTA |
Claude Fable 5 →Step 5 → How the kill line is drawn →
Claude Fable 5 against the other SOTA models
- Qwen 3.8 Flash Next
- Qwen 3.8 Max
- Claude Fable 5.1
- Claude Opus 5.5
- Claude Sonnet 5.5
- DeepSeek V4.1 Flash
- Gemini 3.8 Flash
- Gemini 4 Argon
- Kimi K3
- Muse Spark 1.3
- GPT 5.6 Terra
- GPT 6.1 Sol
- GPT 6 Astra
- GPT 6 Luna
- Grok 4.7
- MiMo V2.6 Flash
- MiMo V2.6 Pro
- GLM 5.3
- GLM 5.3 Flash