Objective comparison based on public benchmarks updated weekly: Intelligence Index, Chatbot Arena ELO, pricing and speed.
Overall winner (2026)
Claude Opus 5.5 (Xhigh, Default Fallback)
4 of 5 criteria won
Anthropic
Intelligence Index
57.0
4 criteria won
View full profile →| Critério | Claude Opus 5.5 (Xhigh, Default Fallback) | GPT-6 Astra (Xhigh) |
|---|---|---|
| Chatbot Arena ELO | — | — |
| Intelligence Index (AA) | 57.0 ✓ | 55.3 |
| Coding Index (AA) | — | 75.9 ✓ |
| Input price ($/1M tok) | $4.00 ✓ | $10.00 |
| Output price ($/1M tok) | $20.00 ✓ | $50.00 |
| Context window | — | — |
| Speed (tokens/s) | 85 tok/s ✓ | 66 tok/s |
✓ = winner in this criterion • Source: Artificial Analysis, LMArena, official APIs • Updated weekly
Choosing between Claude Opus 5.5 (Xhigh, Default Fallback) and GPT-6 Astra (Xhigh) 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 Opus 5.5 (Xhigh, Default Fallback) wins in 4 of 5 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.
Yes. Claude Opus 5.5 (Xhigh, Default Fallback) costs $4/1M input tokens, while GPT-6 Astra (Xhigh) costs $10/1M tokens — 150% more expensive. For high-volume projects, Claude Opus 5.5 (Xhigh, Default Fallback) represents significant savings. Total cost also depends on output pricing and your application's usage pattern.
Context window data is not available for either model at this time.