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GPT-5.1 Thinking vs Kimi K2.5
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. 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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Moonshot AI
Kimi K2.5, released by Moonshot AI in January 2026, is an updated Mixture-of-Experts large language model with 1 trillion total parameters and 32 billion active parameters. It builds on Kimi K2 with improved coding performance across multiple languages and an expanded context window. Kimi K2.5 targets agentic development workflows, polyglot code generation, and open-source deployments requiring large-scale MoE reasoning.
2 months newer
GPT-5.1 Thinking
OpenAI
2025-11
Kimi K2.5
Moonshot AI
2026-01
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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GPT-5.1 Thinking
Average Score:50.0%
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Kimi K2.5
Average Score:50.6%(+0.6%)
Performance comparison across key benchmark categories
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GPT-5.1 Thinking
Coding76.3%
Reasoning23.7%
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Kimi K2.5
Coding76.8%(+0.5%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Thinking
0 providers
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Kimi K2.5
1 providers
Moonshot AI
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GPT-5.1 Thinking
Avg Score:50.0%
Providers:0
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Kimi K2.5
Avg Score:50.6%(+0.6%)
Providers:1