The Known Good Updated 25 Jul 2026
OpenAI: GPT-5.1 vs OpenAI: o1 ·OpenAI vs OpenAI

OpenAI: GPT-5.1 vs OpenAI: o1 — head-to-head comparison

OpenAI: GPT-5.1 profile OpenAI: o1 profile All comparisons
OpenAI: GPT-5.1 — OpenAI
Quality
#20 of 61
74based on 6 of 6 evaluations
Known Good Index
Speed
#119 of 316
61.9
Output tokens per second
Price
#261 of 340
$3.44
Blended per 1M tokens
In $1.25 · Out $10.00
Cache hit price
#105 of 206
$0.12
per 1M tokens (−90%)
Context
#101 of 345
400k
tokens (~600 pages)
OpenAI: o1 — OpenAI
Quality
#30 of 61
63based on 4 of 6 evaluations
Known Good Index
Speed
#263 of 316
24.4
Output tokens per second
Price
#330 of 340
$26.25
Blended per 1M tokens
In $15.00 · Out $60.00
Cache hit price
#206 of 206
$7.50
per 1M tokens (−50%)
Context
#216 of 345
200k
tokens (~300 pages)
Summary

On the Known Good Index, OpenAI: GPT-5.1 scores 74 and OpenAI: o1 scores 63 — a 11-point lead for OpenAI: GPT-5.1. They share 10 published evaluations, with OpenAI: GPT-5.1 ahead on 10 and OpenAI: o1 ahead on 0.

Blended pricing is $3.44 per 1M tokens for OpenAI: GPT-5.1 and $26.25 for OpenAI: o1 — OpenAI: GPT-5.1 is about 7.6× cheaper.

Throughput is 62 tokens per second for OpenAI: GPT-5.1 and 24 for OpenAI: o1, with time to first token at 1.3s and 1.4s. OpenAI: GPT-5.1 accepts 400k tokens of context against 200k.

OpenAI: GPT-5.1 is proprietary; OpenAI: o1 is proprietary. 2 tracked hosts serve one or both, and 1 serve both.

Generated from tracked data on 25 Jul 2026 · how these comparisons are computed →

At a glance
MetricOpenAI: GPT-5.1OpenAI: o1
Known Good Index 74 based on 6 of 6 evaluations 63 based on 4 of 6 evaluations
Blended $/1M $3.44 $26.25
Output tok/s 62 24
Context window 400k 200k
Providers 2 1
Jump to section

Quality

Known Good Index and the capability indices, side by side

IndicesComponents
Index scores

Each index is min-max normalised across tracked models and scaled 0–100 from published evaluations. We do not run these evaluations.

MetricOpenAI: GPT-5.1OpenAI: o1
Known Good Index 74 63
Coding Index 68 —
Mathematics Index 89 85
Science Index 91 78
Reasoning Index 80 62
Agentic Index 61 —
Openness Index 5 5
The Known Good

Quality Breakdown

Every evaluation both models report a published score for

Evaluations both models report

Bar = OpenAI: GPT-5.1 · marker = OpenAI: o1 · scores ingested from Epoch AI (CC-BY 4.0), LiveBench (Apache-2.0)

GPQA Diamond88 / 77
MATH / AIME89 / 73
LiveBench79 / 76
Humanity's Last Exam24 / 8
LiveBench Coding72 / 70
LiveBench Data Analysis72 / 65
LiveBench Instruction Following93 / 82
LiveBench Language80 / 65
LiveBench Mathematics94 / 80
LiveBench Reasoning96 / 92

Right-hand figures read OpenAI: GPT-5.1 / OpenAI: o1. OpenAI: GPT-5.1 leads on 10 of 10, OpenAI: o1 on 0.

The Known Good

Arena Elo

Human preference rating from blind pairwise votes

Arena ratings

Elo from blind pairwise votes, ingested from Arena. Higher is better.

MetricOpenAI: GPT-5.1OpenAI: o1
Text Arena 1,422 —
Text Arena (style controlled) 1,439 —
The Known Good

Price & Cost

Published API pricing by token type

Per token typeCache discount
Published pricing

USD per 1M tokens. Blended is a 3:1 input:output mix. Live from OpenRouter, cross-checked against models.dev. Lower is better.

MetricOpenAI: GPT-5.1OpenAI: o1
Input $/1M $1.25 $15.00
Output $/1M $10.00 $60.00
Blended $/1M $3.44 $26.25
Cache read $/1M $0.125 $7.500
The Known Good
We publish blended price rather than cost-per-task. Cost-per-task requires token counts from an evaluation suite we do not run. Blended price is computed from published rates and is fully reproducible — see the pricing methodology.

Context Window

Maximum input accepted and maximum output emitted

Context and output limits

Provider-declared limits, from metadata via models.dev and OpenRouter. Higher is better.

MetricOpenAI: GPT-5.1OpenAI: o1
Context window 400k 200k
Max output tokens 128k 100k
The Known Good

Speed & Latency

Median throughput and time to first token across hosting providers

Output speedTime to first token
Throughput and latency

Medians across all tracked providers, derived from OpenRouter endpoint telemetry.

MetricOpenAI: GPT-5.1OpenAI: o1
Output tokens/s 62 24
Time to first token 1.3s 1.4s
The Known Good

Providers

Which hosts serve each model, and at what price and speed

2 hosts · 1 serve both
Full provider benchmarks →
Provider OpenAI: GPT-5.1 blendedOpenAI: GPT-5.1 tok/s OpenAI: o1 blendedOpenAI: o1 tok/s
OpenAI · first party $1.72 82 $26.25 13
Azure · first party $3.44 58 — —

Per-host pricing and telemetry from OpenRouter. A dash means that host does not serve that model.

The Known Good
Sources for this page
Pricing & providers — OpenRouter Metadata — models.dev Benchmarks — Epoch AI (CC-BY 4.0)Benchmarks — LiveBench (Apache-2.0)Elo — Arena Full attribution →