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GPT-5.2 vs o3
Comprehensive side-by-side LLM comparison
GPT-5.2 leads with 18.5% higher average benchmark score. Overall, GPT-5.2 is the stronger choice for coding tasks.
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OpenAI
GPT-5.2, released by OpenAI on December 11, 2025, is a large language model from the GPT-5 family that improves on GPT-5 in general intelligence, long-context understanding, agentic tool-calling, and vision. It features a 400K token context window, 128K maximum output tokens, and a knowledge cutoff of August 2025. GPT-5.2 targets long-context coding tasks, extended document analysis, and complex agentic workflows requiring reliable instruction following.
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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.
7 months newer
o3
OpenAI
2025-04-16
GPT-5.2
OpenAI
2025-12-11
Performance Metrics
Context window and performance specifications
Average performance across 5 common benchmarks
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GPT-5.2
Average Score:55.7%(+18.5%)
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o3
Average Score:37.1%
Performance comparison across key benchmark categories
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GPT-5.2
Science93.2%(+24.1%)
Tool Use60.6%(+17.0%)
Agents44.0%(+17.1%)
Reasoning36.6%(+17.4%)
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Knowledge Cutoff
Training data recency comparison
GPT-5.2
2025-08
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-5.2
0 providers
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o3
1 providers
OpenAI
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GPT-5.2
Avg Score:55.7%(+18.5%)
Providers:0
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o3
Avg Score:37.1%
Providers:1