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Kimi K2 vs o3
Comprehensive side-by-side LLM comparison
o3 leads with 19.7% higher average benchmark score. o3 offers 35.8K more tokens in context window than Kimi K2. Kimi K2 is $46.90 cheaper per million tokens. o3 supports multimodal inputs. Overall, o3 is the stronger choice for coding tasks.
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Moonshot AI
Kimi K2, released by Moonshot AI on July 11, 2025, is an open-weight Mixture-of-Experts large language model with 1 trillion total parameters and 32 billion active parameters per inference. It features a 256K token context window (expanded from 128K in an September 2025 update) and demonstrated strong performance on agentic coding benchmarks. Kimi K2 targets software engineering agents, tool-use workflows, and open-source deployments under a modified MIT license.
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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.
2 months newer
o3
OpenAI
2025-04-16
Kimi K2
Moonshot AI
2025-07-11
Pricing Comparison
Cost per million tokens (USD)
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Kimi K2
Input:$0.60
Output:$2.50($46.90 cheaper)
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o3
Input:$10.00
Output:$40.00
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Kimi K2
Average Score:23.9%
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o3
Average Score:43.6%(+19.7%)
Performance comparison across key benchmark categories
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Kimi K2
Tool Use23.9%
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o3
Tool Use43.6%(+19.7%)
Provider Availability & Performance
Available providers and their performance metrics
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Kimi K2
1 providers
Moonshot AI
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o3
1 providers
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Kimi K2
Avg Score:23.9%
Providers:1
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o3
Avg Score:43.6%(+19.7%)
Providers:1