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GPT-5.1 Instant vs Grok 4.1 Fast
Comprehensive side-by-side LLM comparison
. 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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xAI
Grok 4.1 Fast, released by xAI in November 2025, is a fast-response variant from the Grok 4 family featuring a 2M token context window designed for high-throughput applications. It omits thinking tokens for immediate responses, reducing latency while maintaining strong output quality. Grok 4.1 Fast targets production APIs, real-time assistants, and cost-sensitive applications requiring long-context understanding at high volume.
16 days newer
GPT-5.1 Instant
OpenAI
2025-11
Grok 4.1 Fast
xAI
2025-11-17
Performance Metrics
Context window and performance specifications
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Instant
0 providers
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Grok 4.1 Fast
1 providers
xAI
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GPT-5.1 Instant
Avg Score:0.0%
Providers:0
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Grok 4.1 Fast
Avg Score:0.0%
Providers:1