AA-Briefcase
1.1 / combined Elo ↗- GPT-5.5:
- GPT-6 Astra:
Compare models
Find the right model, side by side.
Updated: Data as of:
First model
Second model
Model specifications
| Specifications |  GPT-5.5OpenAI | GPT-6 AstraOpenAI |
|---|---|---|
| Provider | ||
| Context sizetokens | 1,050,000 | 1,000,000 |
| Cutoff date | Not reported | 2026-04-30 |
| Input costUSD / 1M tokens | $5.00 | $10.00 |
| Output costUSD / 1M tokens | $30.00 | $50.00 |
| Max outputtokens | 128,000 | 128,000 |
| LatencyTTFT · seconds | 80.223 | 365.127 |
| Speedtokens / sec | 95.007 | 70.564 |
Benchmark performance
10 shared benchmark comparisons. Versions and setups matched.
GPT-5.5GPT-6 Astra
AutomationBench
1.0.6 / Zapier held-out private set ↗- GPT-5.5:
- GPT-6 Astra:
AutomationBench-AA
1.0.6 / AA private 657 ↗Tools enabled- GPT-5.5:
- GPT-6 Astra:
DeepSWE
v1.1 ↗- GPT-5.5:
- GPT-6 Astra:
- GPT-5.5:
- GPT-6 Astra:
GDPval-AA
2.1 ↗- GPT-5.5:
- GPT-6 Astra:
GPQA Diamond
Diamond / Independent evaluation ↗- GPT-5.5:
- GPT-6 Astra:
Humanity’s Last Exam
Stable HLE — full set ↗Tools enabled- GPT-5.5:
- GPT-6 Astra:
LifeVal
November 2026 ↗- GPT-5.5:
- GPT-6 Astra:
Terminal-Bench
4.0 / mini-swe-agent ↗mini-swe-agent- GPT-5.5:
- GPT-6 Astra:
