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GPT-5 vs o3
Comprehensive side-by-side LLM comparison
GPT-5 leads with 6.2% higher average benchmark score. GPT-5 offers 132.8K more tokens in context window than o3. o3 is $100.00 cheaper per million tokens. Overall, GPT-5 is the stronger choice for coding tasks.
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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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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
OpenAI
2025-08-07
Pricing Comparison
Cost per million tokens (USD)
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GPT-5
Input:$30.00
Output:$120.00
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o3
Input:$10.00
Output:$40.00($100.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 5 common benchmarks
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GPT-5
Average Score:54.1%(+6.2%)
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o3
Average Score:47.8%
Performance comparison across key benchmark categories
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GPT-5
Science87.3%(+18.2%)
Multimodal78.4%(+2.0%)
Tool Use44.5%(+0.9%)
Agents34.8%(+4.0%)
Reasoning25.3%(+6.1%)
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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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o3
1 providers
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GPT-5
Avg Score:54.1%(+6.2%)
Providers:1
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o3
Avg Score:47.8%
Providers:1