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Gemini 2.5 Flash vs GPT-5.1 Thinking
Comprehensive side-by-side LLM comparison
GPT-5.1 Thinking leads with 11.6% higher average benchmark score. Gemini 2.5 Flash is available on 2 providers. Overall, GPT-5.1 Thinking 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
GPT-5.1 Thinking, released by OpenAI in November 2025, is an extended reasoning variant from the GPT-5.1 family that applies chain-of-thought processing to improve accuracy on complex reasoning, mathematics, and coding tasks. It targets analytical workflows where deliberate reasoning over a problem significantly improves output quality.
4 months newer
Gemini 2.5 Flash
Google DeepMind
2025-06-17
GPT-5.1 Thinking
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Gemini 2.5 Flash
Average Score:12.1%
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GPT-5.1 Thinking
Average Score:23.7%(+11.6%)
Performance comparison across key benchmark categories
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Gemini 2.5 Flash
Reasoning12.1%
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GPT-5.1 Thinking
Reasoning23.7%(+11.6%)
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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GPT-5.1 Thinking
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Gemini 2.5 Flash
Avg Score:12.1%
Providers:2
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GPT-5.1 Thinking
Avg Score:23.7%(+11.6%)
Providers:0