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GPT-5 vs GPT-5.1 Instant
Comprehensive side-by-side LLM comparison
GPT-5.1 Instant leads with 1.4% higher average benchmark score. Both models have their strengths depending on your specific coding needs.
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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
GPT-5.1 Instant, released by OpenAI in November 2025, is a low-latency variant from the GPT-5.1 family optimized for fast response times and high-throughput workloads. It targets real-time applications, conversational assistants, and production APIs where response speed is a primary requirement alongside GPT-5.1-generation reasoning quality.
2 months newer
GPT-5
OpenAI
2025-08-07
GPT-5.1 Instant
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-5
Average Score:74.9%
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GPT-5.1 Instant
Average Score:76.3%(+1.4%)
Performance comparison across key benchmark categories
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GPT-5
Coding74.9%
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GPT-5.1 Instant
Coding76.3%(+1.4%)
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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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GPT-5.1 Instant
0 providers
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GPT-5
Avg Score:74.9%
Providers:1
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GPT-5.1 Instant
Avg Score:76.3%(+1.4%)
Providers:0