GPT-5.1 vs GPT-5.1 Instant
GPT-5.1 and GPT-5.1 Instant are closely matched at 36.4 and 36.5 on the LLM Stats Score. GPT-5.1 and GPT-5.1 Instant cost the same.
OpenAI · OpenAI · Updated for 2026
Which is better?
GPT-5.1 and GPT-5.1 Instant are closely matched on the overall LLM Stats Score at 36.4 and 36.5.
In the 9 individual benchmarks reported for both models, GPT-5.1 Instant wins 9; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.1
- you want the most recent training data — it shipped Nov 2025
Choose GPT-5.1 Instant
- you value its reported benchmark strengths — it wins 9 of 9 exact shared results
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
9 reported for GPT-5.1 · 9 for GPT-5.1 Instant
GPT-5.1 outperforms in 0 benchmarks, while GPT-5.1 Instant is better at 0 benchmarks.
Both models are evenly matched across the benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.1 ($1.25/1M tokens) costs the same as GPT-5.1 Instant ($1.25/1M tokens).
For output processing, GPT-5.1 ($10.00/1M tokens) costs the same as GPT-5.1 Instant ($10.00/1M tokens).
In conclusion, GPT-5.1 and GPT-5.1 Instant cost the same.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 400,000 tokens. Both models can generate responses up to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-5.1 and GPT-5.1 Instant support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.1
GPT-5.1 Instant
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-5.1 was released on 2025-11-13, while GPT-5.1 Instant was released on 2025-11-12.
GPT-5.1 is 0 month newer than GPT-5.1 Instant.
Nov 13, 2025
10 months ago
1d newerNov 12, 2025
10 months ago
Knowledge Cutoff
When training data ends
GPT-5.1 has a documented knowledge cutoff of 2024-09-30, while GPT-5.1 Instant's cutoff date is not specified.
We can confirm GPT-5.1's training data extends to 2024-09-30, but cannot make a direct comparison without GPT-5.1 Instant's cutoff date.
Sep 2024
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Provider Availability
GPT-5.1 is available from OpenAI. GPT-5.1 Instant is available from OpenAI.
GPT-5.1
GPT-5.1 Instant
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.1 and GPT-5.1 Instant side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.1 vs GPT-5.1 Instant.