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GPT-5.1 Thinking vs GPT-5.3 Codex
Comprehensive side-by-side LLM comparison
GPT-5.1 Thinking supports multimodal inputs. 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
GPT-5.3 Codex, released by OpenAI in February 2026, is a coding-specialized large language model from the GPT-5.3 family. It targets software engineering workflows including automated code generation, test writing, and agentic multi-file editing, built on the incremental improvements of the GPT-5.3 generation.
3 months newer
GPT-5.1 Thinking
OpenAI
2025-11
GPT-5.3 Codex
OpenAI
2026-02
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Thinking
0 providers
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GPT-5.3 Codex
0 providers
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GPT-5.1 Thinking
Avg Score:0.0%
Providers:0
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GPT-5.3 Codex
Avg Score:0.0%
Providers:0