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Claude Fable 5 vs GPT-5.6
Of the 6 public leaderboards that rate both, Claude Fable 5 scores higher on 5 and GPT-5.6 on 1. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5 is at 85.1 and GPT-5.6 at 70.2 (out of 100).
Scores as published by each board; table composed September 25, 2026.
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Leaderboard by leaderboard
| Board | Claude Fable 5 | GPT-5.6 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,626.8 | 1,617.1 | Claude Fable 5 |
| LiveBench global average (0-100) | 83 | 81.1 | Claude Fable 5 |
| SimpleBench AVG@5 % (private set) | 81.9 | 71.7 | Claude Fable 5 |
| LLM Stats LLM Stats Score · composite (0-100), their rendered top 15 | 54 | 54.4 | GPT-5.6 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 66 | 63.7 | Claude Fable 5 |
| Artificial Analysis intelligence index · measured runs only | 49.6 | 47 | Claude Fable 5 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
Claude Fable 5 at a glance
- Developer
- Anthropic
- Status
- Live since July 1, 2026
- API price
- $10 input / $50 output per 1M tokens · Anthropic, claude-fable-5
- Context window
- 1M tokens
Returned Jul 1.
GPT-5.6 at a glance
- Developer
- OpenAI
- Status
- Live since July 9, 2026
- API price
- $4 input / $20 output per 1M tokens · OpenAI, gpt-5.6
- Context window
- 1.05M tokens
Live — Sol · Terra · Luna since Jul 9 · repriced Jul 30: Luna −80%, Terra −20%.
Three ChatGPT leaks in five hours were one release note — and the line none of them quoted is the real change
2026-08-06 · Three separate leaks landed in five hours claiming three separate ChatGPT changes: an upgraded GPT-5.6 Sol for Plus and Pro, a new reasoning slider rolling out, and unlimited chats coming for free users. All three are real.
OpenAI cut Luna 80% — Azure kept the old price, so Luna costs 5× more on Azure than direct
2026-08-04 · OpenAI cut GPT-5.6 Luna by 80% on July 30. We covered it. What we did not check — and should have, because it is the number that actually lands on a bill — is whether the clouds passed it on.
Claude Fable 5 vs GPT-5.6: quick answers
Which is better, Claude Fable 5 or GPT-5.6?
It depends on what you measure. Of the 6 public leaderboards that rate both, Claude Fable 5 scores higher on 5 and GPT-5.6 on 1. Claude Fable 5's widest lead is on SimpleBench; GPT-5.6's widest lead is on LLM Stats. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5 is at 85.1 and GPT-5.6 at 70.2 (out of 100).
Which is newer, Claude Fable 5 or GPT-5.6?
GPT-5.6. It went live on July 9, 2026, 8 days after Claude Fable 5 (July 1, 2026).
Which is cheaper, Claude Fable 5 or GPT-5.6?
GPT-5.6 is cheaper on both input and output. On each vendor's own API, Claude Fable 5 is $10 input / $50 output per million tokens and GPT-5.6 is $4 input / $20 output per million tokens. GPT-5.6's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-09-25.
Which has the bigger context window, Claude Fable 5 or GPT-5.6?
GPT-5.6, at 1.05M tokens against Claude Fable 5's 1M, as each vendor lists it.
Who makes Claude Fable 5 and GPT-5.6?
Claude Fable 5 is from Anthropic; GPT-5.6 is from OpenAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 25, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · the wire