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GPT-5.1 Instant vs Kimi K2.5
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. 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 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.
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Moonshot AI
Kimi K2.5, released by Moonshot AI in January 2026, is an updated Mixture-of-Experts large language model with 1 trillion total parameters and 32 billion active parameters. It builds on Kimi K2 with improved coding performance across multiple languages and an expanded context window. Kimi K2.5 targets agentic development workflows, polyglot code generation, and open-source deployments requiring large-scale MoE reasoning.
2 months newer
GPT-5.1 Instant
OpenAI
2025-11
Kimi K2.5
Moonshot AI
2026-01
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-5.1 Instant
Average Score:76.3%
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Kimi K2.5
Average Score:76.8%(+0.5%)
Performance comparison across key benchmark categories
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GPT-5.1 Instant
Coding76.3%
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Kimi K2.5
Coding76.8%(+0.5%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Instant
0 providers
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Kimi K2.5
1 providers
Moonshot AI
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GPT-5.1 Instant
Avg Score:76.3%
Providers:0
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Kimi K2.5
Avg Score:76.8%(+0.5%)
Providers:1