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Gemini 3 Flash vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
Gemini 3 Flash leads with 9.0% higher average benchmark score. Gemini 3 Flash supports multimodal inputs. Gemini 3 Flash is available on 2 providers. Overall, Gemini 3 Flash is the stronger choice for coding tasks.
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Google DeepMind
Gemini 3 Flash, released by Google in December 2025, is a large language model from the Gemini 3 family that delivers reasoning and coding performance with efficiency optimized for high-volume workloads. It features a 1M token context window, 64K maximum output tokens, and native support for text, image, audio, video, and PDF input. Gemini 3 Flash targets cost-sensitive agentic workflows, document processing, and production APIs requiring fast, capable multimodal responses.
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OpenAI
GPT-5 Codex, released by OpenAI in August 2025, is a coding-specialized large language model from the GPT-5 family engineered for software engineering, code generation, and agentic development workflows. It builds on GPT-5's architecture with optimizations targeting multi-file code editing, test generation, and automated debugging. GPT-5 Codex targets developers and agentic coding tools requiring a model tuned specifically for programming tasks.
4 months newer
GPT-5 Codex
OpenAI
2025-08
Gemini 3 Flash
Google DeepMind
2025-12-17
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Gemini 3 Flash
Average Score:63.0%(+9.0%)
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GPT-5 Codex
Average Score:54.0%
Performance comparison across key benchmark categories
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Gemini 3 Flash
Coding63.0%(+9.0%)
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GPT-5 Codex
Coding54.0%
Provider Availability & Performance
Available providers and their performance metrics
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Gemini 3 Flash
2 providers
Google Cloud Vertex AI
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GPT-5 Codex
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Gemini 3 Flash
Avg Score:63.0%(+9.0%)
Providers:2
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GPT-5 Codex
Avg Score:54.0%
Providers:0