GPT-5.1 High vs GPT-6 Sol
GPT-6 Sol leads the LLM Stats Score 49.4 to 35.2. GPT-5.1 High is 1.2x cheaper per token.
OpenAI · OpenAI · Updated for 2026
Which is better?
GPT-6 Sol leads the overall LLM Stats Score 49.4 to 35.2, ranking #21 overall.
On price, GPT-5.1 High is roughly 1.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-6 Sol also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.1 High
- cost matters — it's about 1.2x cheaper per token
Choose GPT-6 Sol
- overall performance matters — it scores 49.4 and ranks #21 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you process long inputs — it offers a 1,050,000 token context window
- you want the most recent training data — it shipped Sep 2026
At a glance
The differences that matter most.
Individual benchmarks
3 reported for GPT-5.1 High · 5 for GPT-6 Sol
GPT-5.1 High and GPT-6 Soldon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.1 High ($1.25/1M tokens) is 1.6x cheaper than GPT-6 Sol ($2.00/1M tokens).
For output processing, GPT-5.1 High ($10.00/1M tokens) costs the same as GPT-6 Sol ($10.00/1M tokens).
In conclusion, GPT-6 Sol is more expensive than GPT-5.1 High.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-6 Sol accepts 1,050,000 input tokens compared to GPT-5.1 High's 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 High and GPT-6 Sol support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.1 High
GPT-6 Sol
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 High was released on 2025-11-12, while GPT-6 Sol was released on 2026-09-22.
GPT-6 Sol is 10 months newer than GPT-5.1 High.
Nov 12, 2025
10 months ago
Sep 22, 2026
0 days ago
10mo newerKnowledge Cutoff
When training data ends
GPT-6 Sol has a documented knowledge cutoff of 2026-04-20, while GPT-5.1 High's cutoff date is not specified.
We can confirm GPT-6 Sol's training data extends to 2026-04-20, but cannot make a direct comparison without GPT-5.1 High's cutoff date.
—
Apr 2026
Provider Availability
GPT-5.1 High is available from OpenAI. GPT-6 Sol is available from OpenAI.
GPT-5.1 High
GPT-6 Sol
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.1 High and GPT-6 Sol side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.1 High vs GPT-6 Sol.