Head-to-head
GPT-5.5 vs GPT-6 Astra
As of October 25, 2026, GPT-6 Astra leads GPT-5.5 on the Analyzer Index, 95.1 to 91.2.
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.
GPT-5.5
OpenAIGPT-6 Astra
OpenAI| At a glance | GPT-5.5 | GPT-6 Astra |
|---|---|---|
| Analyzer Index | 91.2 (7/13) | 95.1 (6/13) |
| Blended price | $5.63/M | $10.00/M |
| Cheapest host | maker's API | maker's API |
| Context | 400k | 1.1M |
| Output speed | 104 tok/s | 47 tok/s |
| Time to first token | 2.23 s | 1.63 s |
| Benchmark | GPT-5.5 | GPT-6 Astra |
|---|---|---|
Chatbot Arena Elo Arena | ||
Output Speed Speed | ||
Time to First Token TTFT | ||
FrontierMath Tiers 1-3 FrontierMath | — | |
SimpleQA Verified SimpleQA | ||
OTIS Mock AIME 2024-2025 OTIS AIME | ||
Humanity's Last Exam HLE | — | |
ARC-AGI 2 ARC-AGI 2 | ||
Terminal-Bench 2 TermBench 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.