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GPT-5.1 vs o1
Comprehensive side-by-side LLM comparison
. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5.1, released by OpenAI in November 2025, is a large language model from the GPT-5 family that delivers incremental improvements in reasoning, instruction following, and multimodal understanding over GPT-5. It features a 400K token context window and targets general-purpose development, long-context analysis, and agentic workflows.
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OpenAI
OpenAI o1, released by OpenAI in December 2024, is a reasoning-focused large language model that applies extended chain-of-thought processing before generating responses. It features a 200K token context window and native image understanding, demonstrating strong performance on STEM benchmarks requiring multi-step reasoning. o1 targets mathematics, science, and coding tasks where careful deliberation over the problem produces more accurate outputs than direct generation.
11 months newer
o1
OpenAI
2024-12-05
GPT-5.1
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-5.1
Average Score:76.0%(+77.0%)
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o1
Average Score:-1.0%
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Knowledge Cutoff
Training data recency comparison
o1
2023-10
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1
0 providers
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o1
1 providers
OpenAI
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GPT-5.1
Avg Score:76.0%(+77.0%)
Providers:0
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o1
Avg Score:-1.0%
Providers:1