GPT-5.1 Instant vs GPT-5.1 Thinking
GPT-5.1 Instant and GPT-5.1 Thinking are closely matched at 36.7 and 36.8 on the LLM Stats Score. GPT-5.1 Instant and GPT-5.1 Thinking cost the same.
OpenAI · OpenAI · Updated for 2026
Which is better?
GPT-5.1 Instant and GPT-5.1 Thinking are closely matched on the overall LLM Stats Score at 36.7 and 36.8.
In the 9 individual benchmarks reported for both models, GPT-5.1 Thinking 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 Instant
- you want predictable pricing at $1.25/M input and $10.00/M output
Choose GPT-5.1 Thinking
- 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 Instant · 9 for GPT-5.1 Thinking
GPT-5.1 Instant outperforms in 0 benchmarks, while GPT-5.1 Thinking 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 Instant ($1.25/1M tokens) costs the same as GPT-5.1 Thinking ($1.25/1M tokens).
For output processing, GPT-5.1 Instant ($10.00/1M tokens) costs the same as GPT-5.1 Thinking ($10.00/1M tokens).
In conclusion, GPT-5.1 Instant and GPT-5.1 Thinking 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 Instant and GPT-5.1 Thinking support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.1 Instant
GPT-5.1 Thinking
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
Both models were released on 2025-11-12.
They likely represent similar generations of model development.
Nov 12, 2025
11 months ago
Nov 12, 2025
11 months ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GPT-5.1 Instant is available from OpenAI. GPT-5.1 Thinking is available from OpenAI.
GPT-5.1 Instant
GPT-5.1 Thinking
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.1 Instant and GPT-5.1 Thinking side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.1 Instant vs GPT-5.1 Thinking.