Compare · ModelsLive · 2 picked · head to head
GPT-5.5 Pro vs GPT-6 Astra
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-6 Astra wins on 1/1 benchmarks
GPT-6 Astra wins 1 of 1 shared benchmarks. Leads in knowledge.
Category leads
knowledge·GPT-6 Astra
Hype vs Reality
Attention vs performance
GPT-5.5 Pro
#1 by perf·#4 by attention
GPT-6 Astra
#9 by perf·#1 by attention
Best value
GPT-6 Astra
3.1x better value than GPT-5.5 Pro
GPT-5.5 Pro
0.8 pts/$
$105.00/M
GPT-6 Astra
2.6 pts/$
$30.00/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
1 benchmark · 2 models
GPT-5.5 ProGPT-6 Astra
GPQA diamond
GPT-6 Astra leads by +0.2
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
GPT-5.5 Pro
94.2
GPT-6 Astra
94.4
Full benchmark table
| Benchmark | GPT-5.5 Pro | GPT-6 Astra |
|---|---|---|
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 94.2 | 94.4 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $30.00 | $180.00 | 400K tokens (~200 books) | $675.00 | |
| $10.00 | $50.00 | 1.1M tokens (~525 books) | $200.00 |