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GPT-5.1 Thinking vs o4 mini
Comprehensive side-by-side LLM comparison
GPT-5.1 Thinking leads with 9.4% higher average benchmark score. Overall, GPT-5.1 Thinking is the stronger choice for coding tasks.
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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 o4 mini, released by OpenAI in April 2025, is a compact reasoning model from the o4 family that combines multimodal understanding with efficient chain-of-thought processing. It features a 200K token context window and native image understanding, with strong performance on mathematics and coding benchmarks relative to its inference cost. o4 mini targets cost-sensitive applications requiring both visual reasoning and mathematical accuracy.
6 months newer
o4 mini
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%(+9.4%)
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o4 mini
Average Score:14.3%
Performance comparison across key benchmark categories
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GPT-5.1 Thinking
Reasoning23.7%(+9.4%)
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o4 mini
Reasoning14.3%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Thinking
0 providers
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o4 mini
1 providers
OpenAI
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GPT-5.1 Thinking
Avg Score:23.7%(+9.4%)
Providers:0
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o4 mini
Avg Score:14.3%
Providers:1