Head-to-head
Claude Opus 5.5 vs GPT-6 Astra
As of October 25, 2026, Claude Opus 5.5 leads GPT-6 Astra on the Analyzer Index, 98.4 to 95.1.
Normalized scores are min-maxed per benchmark across all models we track (0–100). Open the interactive compare view to add benchmarks to the radar chart or pull in more models.
Claude Opus 5.5
AnthropicGPT-6 Astra
OpenAI| At a glance | Claude Opus 5.5 | GPT-6 Astra |
|---|---|---|
| Analyzer Index | 98.4 (5/13) | 95.1 (6/13) |
| Blended price | $8.00/M | $10.00/M |
| Cheapest host | maker's API | maker's API |
| Context | 1.0M | 1.1M |
| Output speed | 245 tok/s | 47 tok/s |
| Time to first token | 4.00 s | 1.63 s |
| Benchmark | Claude Opus 5.5 | GPT-6 Astra |
|---|---|---|
Chatbot Arena Elo Arena | ||
Output Speed Speed | ||
Time to First Token TTFT | ||
SimpleQA Verified SimpleQA | ||
OTIS Mock AIME 2024-2025 OTIS AIME | ||
Humanity's Last Exam HLE | — | |
ARC-AGI 2 ARC-AGI 2 | ||
Frontier Composite Frontier | ||
Output Stability Stability | ||
Format Adherence Format | ||
Recovery Rate Recovery | ||
API Success Rate API OK | ||
Safety Handling Safety |
Methodology matches the main AI Model Analyzer About page.