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GPT-5.1 Codex vs GPT-5.1 Instant
Comprehensive side-by-side LLM comparison
GPT-5.1 Instant leads with 2.6% higher average benchmark score. GPT-5.1 Instant supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5.1 Codex, released by OpenAI in November 2025, is a coding-specialized model from the GPT-5.1 family engineered for software engineering tasks including code generation, multi-file editing, and agentic development. It targets developers and automated coding pipelines requiring a GPT-5.1-generation model tuned for programming.
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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.
Launched on the same date
GPT-5.1 Codex
OpenAI
2025-11
GPT-5.1 Instant
OpenAI
2025-11
Average performance across 1 common benchmarks
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GPT-5.1 Codex
Average Score:73.7%
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GPT-5.1 Instant
Average Score:76.3%(+2.6%)
Performance comparison across key benchmark categories
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GPT-5.1 Codex
Coding73.7%
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GPT-5.1 Instant
Coding76.3%(+2.6%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Codex
0 providers
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GPT-5.1 Instant
0 providers
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GPT-5.1 Codex
Avg Score:73.7%
Providers:0
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GPT-5.1 Instant
Avg Score:76.3%(+2.6%)
Providers:0