Objective comparison based on public benchmarks updated weekly: Intelligence Index, Chatbot Arena ELO, pricing and speed.
Overall winner (2026)
Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)
4 of 7 criteria won
Anthropic
ELO Arena
1501
Intelligence Index
53.4
Coding Index
81.6
4 criteria won
View full profile →| Critério | Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) | GPT-6.1 Sol (max) |
|---|---|---|
| Chatbot Arena ELO | 1501 ✓ | — |
| Intelligence Index (AA) | 53.4 ✓ | 51.8 |
| Coding Index (AA) | 81.6 ✓ | — |
| Input price ($/1M tok) | $10.00 | $2.00 ✓ |
| Output price ($/1M tok) | $50.00 | $10.00 ✓ |
| Context window | 1.0M tokens | 1.1M tokens ✓ |
| Speed (tokens/s) | 68 tok/s ✓ | 64 tok/s |
✓ = winner in this criterion • Source: Artificial Analysis, LMArena, official APIs • Updated weekly
Choosing between Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) and GPT-6.1 Sol (max) depends on your use case, budget and technical requirements. Below, a practical guide based on benchmark data and each model's specifications.
Anthropic · Text
OpenAI · Text
Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) wins in 4 of 7 criteria analyzed. Check the full table to choose based on your use case.
Data is aggregated from Artificial Analysis (Intelligence Index, Coding Index) and Chatbot Arena/LMArena (ELO). Pricing and specs come from official APIs. Updated weekly.
The Intelligence Index is an aggregate score from Artificial Analysis that combines multiple academic benchmarks (MMLU, GPQA, LiveBench, etc.) into a single rating. The higher the score, the more capable the model is at reasoning tasks.
No. GPT-6.1 Sol (max) is cheaper: $2/1M input tokens vs $10/1M tokens for Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) — a 400% difference. For high-volume projects, GPT-6.1 Sol (max) can reduce costs substantially.
GPT-6.1 Sol (max) has the larger context window: 1.1M tokens vs 1.0M tokens. For long document analysis, extensive transcripts or full codebases, the larger context window is a decisive criterion.