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GPT-5 Mini vs o3
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. GPT-5 Mini offers 132.8K more tokens in context window than o3. GPT-5 Mini is $25.00 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5 mini, released by OpenAI in August 2025, is a smaller variant from the GPT-5 family that inherits GPT-5's unified reasoning architecture and multimodal capabilities at a reduced inference cost. It targets high-volume production use cases requiring a balance of intelligence and response speed, offering GPT-5 capabilities for applications where full GPT-5 inference costs are a concern.
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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.
3 months newer
o3
OpenAI
2025-04-16
GPT-5 Mini
OpenAI
2025-08
Pricing Comparison
Cost per million tokens (USD)
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GPT-5 Mini
Input:$5.00
Output:$20.00($25.00 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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GPT-5 Mini
Average Score:19.4%(+0.2%)
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o3
Average Score:19.2%
Performance comparison across key benchmark categories
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GPT-5 Mini
Reasoning19.4%(+0.2%)
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o3
Reasoning19.2%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5 Mini
1 providers
OpenAI
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o3
1 providers
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GPT-5 Mini
Avg Score:19.4%(+0.2%)
Providers:1
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o3
Avg Score:19.2%
Providers:1