GPT-5.1 vs GPT-6 Astra
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.1 by OpenAI and GPT-6 Astra by OpenAI are evenly matched across 6 benchmarks. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, GPT-6 Astra scores 76.9 on AA Coding Index compared to GPT-5.1's 49.4.
Reasoning: In reasoning, GPT-6 Astra scores 94.4% on GPQA Diamond compared to GPT-5.1's 86.2%.
Context: In context, GPT-6 Astra scores 1.1M on Context Length compared to GPT-5.1's 400K.
Pricing Comparison
GPT-5.1 costs $1.3/1M input tokens and $10.0/1M output tokens, while GPT-6 Astra costs $10.0/1M input and $50.0/1M output. GPT-5.1 is the more affordable option for API usage.
Verdict
GPT-5.1 leads across the board in affordability, making it the stronger overall choice in this comparison.
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GPT-5.1 vs GPT-6 Astra — FAQ
Which is better, GPT-5.1 or GPT-6 Astra?
GPT-5.1 and GPT-6 Astra are evenly matched across benchmarks. The best choice depends on your specific priorities such as coding ability, speed, or pricing.
How does GPT-5.1 compare to GPT-6 Astra for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is GPT-5.1 cheaper than GPT-6 Astra?
Yes, GPT-5.1 is cheaper. GPT-5.1 costs $1.3/1M input and $10.0/1M output tokens. GPT-6 Astra costs $10.0/1M input and $50.0/1M output tokens.
Which is faster, GPT-5.1 or GPT-6 Astra?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the GPT-5.1 vs GPT-6 Astra comparison cover?
This comparison covers 6 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, AA Coding Index, Cached Input Cost. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.