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GPT-5 vs Kimi K2.5
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. GPT-5 offers 168.6K more tokens in context window than Kimi K2.5. Kimi K2.5 is $142.50 cheaper per million tokens. GPT-5 supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5, released by OpenAI on August 7, 2025, is a large language model that combines direct generation and extended reasoning in a single unified system with a built-in routing mechanism. It features a 400K token context window, 128K maximum output tokens, native multimodal support (text, image, audio, video), and demonstrated strong results across coding, mathematics, visual understanding, and health benchmarks at release. GPT-5 targets complex multi-step tasks including advanced coding, mathematical problem solving, and long-context analysis.
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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.
4 months newer
GPT-5
OpenAI
2025-08-07
Kimi K2.5
Moonshot AI
2026-01
Pricing Comparison
Cost per million tokens (USD)
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GPT-5
Input:$30.00
Output:$120.00
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Kimi K2.5
Input:$1.50
Output:$6.00($142.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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GPT-5
Average Score:50.1%
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Kimi K2.5
Average Score:50.6%(+0.5%)
Performance comparison across key benchmark categories
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GPT-5
Coding74.9%
Reasoning25.3%(+0.9%)
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Kimi K2.5
Coding76.8%
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Knowledge Cutoff
Training data recency comparison
GPT-5
2025-05
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 providers
OpenAI
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Kimi K2.5
1 providers
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GPT-5
Avg Score:50.1%
Providers:1
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Kimi K2.5
Avg Score:50.6%(+0.5%)
Providers:1