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GPT-5.1 Thinking vs o3
Comprehensive side-by-side LLM comparison
GPT-5.1 Thinking leads with 4.5% higher average benchmark score. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5.1 Thinking, released by OpenAI in November 2025, is an extended reasoning variant from the GPT-5.1 family that applies chain-of-thought processing to improve accuracy on complex reasoning, mathematics, and coding tasks. It targets analytical workflows where deliberate reasoning over a problem significantly improves output quality.
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OpenAI
OpenAI o3, released by OpenAI in April 2025, is a large reasoning model that applies extended chain-of-thought processing to deliver improved performance on complex math, science, and coding tasks. It features a 200K token context window and native image understanding, with demonstrated strong results on mathematics and software engineering benchmarks. o3 targets demanding analytical and engineering tasks where deliberate, multi-step reasoning produces significantly better outcomes than direct generation.
6 months newer
o3
OpenAI
2025-04-16
GPT-5.1 Thinking
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-5.1 Thinking
Average Score:23.7%(+4.5%)
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o3
Average Score:19.2%
Performance comparison across key benchmark categories
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GPT-5.1 Thinking
Reasoning23.7%(+4.5%)
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o3
Reasoning19.2%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Thinking
0 providers
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o3
1 providers
OpenAI
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GPT-5.1 Thinking
Avg Score:23.7%(+4.5%)
Providers:0
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o3
Avg Score:19.2%
Providers:1