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Gemini 2.5 Flash vs o3
Comprehensive side-by-side LLM comparison
o3 leads with 28.9% higher average benchmark score. Gemini 2.5 Flash offers 708.2K more tokens in context window than o3. Gemini 2.5 Flash is $49.25 cheaper per million tokens. Overall, o3 is the stronger choice for coding tasks.
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Google DeepMind
Gemini 2.5 Flash, released by Google in June 2025, is a large language model from the Gemini 2.5 family optimized for high-throughput, cost-efficient deployments with multimodal reasoning. It features a 1M token context window, hybrid thinking control, and native support for text, image, video, and audio input. Gemini 2.5 Flash targets latency-sensitive applications, document analysis, and high-volume API workloads that benefit from combined reasoning and generation in a single model.
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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
Gemini 2.5 Flash
Google DeepMind
2025-06-17
Pricing Comparison
Cost per million tokens (USD)
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Gemini 2.5 Flash
Input:$0.15
Output:$0.60($49.25 cheaper)
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o3
Input:$10.00
Output:$40.00
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Gemini 2.5 Flash
Average Score:23.2%
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o3
Average Score:52.1%(+28.9%)
Performance comparison across key benchmark categories
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Gemini 2.5 Flash
Science78.3%(+9.2%)
Tool Use3.4%
Reasoning12.1%
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Provider Availability & Performance
Available providers and their performance metrics
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Gemini 2.5 Flash
2 providers
Google Cloud Vertex AI
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o3
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Gemini 2.5 Flash
Avg Score:23.2%
Providers:2
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o3
Avg Score:52.1%(+28.9%)
Providers:1