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o1 vs o1-preview

o1 and o1-preview are closely matched at 20.9 and 16.6 on the LLM Stats Score. o1 and o1-preview cost the same.

OpenAI · OpenAI · Updated for 2026

Which is better?

o1 and o1-preview are closely matched on the overall LLM Stats Score at 20.9 and 16.6.

In the 8 individual benchmarks reported for both models, o1 wins 6; this is a narrower head-to-head signal than the composite indexes.

o1 also accepts a larger context window (200,000 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 o1

  • you value its reported benchmark strengths — it wins 6 of 8 exact shared results
  • you process long inputs — it offers a 200,000 token context window
  • you want the most recent training data — it shipped Dec 2024

Choose o1-preview

  • you want predictable pricing at $15.00/M input and $60.00/M output

At a glance

The differences that matter most.

o1
OpenAI
o1-preview
OpenAI
Core performance indexes
LLM Stats Score
20.9
#197
16.6
#226
Reasoning
21.3
#187
16.8
#219
Coding
4.6
#212
-3.2
#258
Cost, coverage & limits
Benchmark wins
6 of 8
2 of 8
Input price
$15.00 / M
$15.00 / M
Output price
$60.00 / M
$60.00 / M
Context window
200,000
128,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
o1
o1-preview
Math
24.0#122
20.2#162
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

19 reported for o1 · 8 for o1-preview

8 shared

o1 outperforms in 6 benchmarks (AIME 2024, GPQA, LiveBench, MATH, MMLU, SimpleQA), while o1-preview is better at 2 benchmarks (MGSM, SWE-Bench Verified).

o1 shows notably better performance in the majority of benchmarks.

Wed Sep 23 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

For input processing, o1 ($15.00/1M tokens) costs the same as o1-preview ($15.00/1M tokens).

For output processing, o1 ($60.00/1M tokens) costs the same as o1-preview ($60.00/1M tokens).

In conclusion, o1 and o1-preview cost the same.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed Sep 23 2026 • llm-stats.com
OpenAI
o1
Input tokens$15.00
Output tokens$60.00
Best providerAzure
OpenAI
o1-preview
Input tokens$15.00
Output tokens$60.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

o1 accepts 200,000 input tokens compared to o1-preview's 128,000 tokens. o1 can generate longer responses up to 100,000 tokens, while o1-preview is limited to 32,768 tokens.

OpenAI
o1
Input200,000 tokens
Output100,000 tokens
OpenAI
o1-preview
Input128,000 tokens
Output32,768 tokens
Wed Sep 23 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

o1

Proprietary

Closed source

o1-preview

Proprietary

Closed source

Release Timeline

When each model was launched

o1 was released on 2024-12-17, while o1-preview was released on 2024-09-12.

o1 is 3 months newer than o1-preview.

o1

Dec 17, 2024

1.8 years ago

3mo newer
o1-preview

Sep 12, 2024

2.0 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

o1 is available from Azure, OpenAI. o1-preview is available from OpenAI, Azure.

o1

azure logo
Azure
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M
openai logo
OpenAI
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M

o1-preview

openai logo
OpenAI
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M
azure logo
Azure
Input Price:Input: $16.50/1MOutput Price:Output: $66.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against o1 and o1-preview side-by-side, then vote on the output you prefer.

o1
✓ Preferred
o1-preview
Open in Playground

FAQ

Common questions about o1 vs o1-preview.

Which is better, o1 or o1-preview?

o1 and o1-preview are closely matched on the LLM Stats Score at 20.9 and 16.6. o1 is made by OpenAI and o1-preview is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does o1 compare to o1-preview in benchmarks?

o1 scores GSM8k: 97.1%, MATH: 96.4%, GPQA Physics: 92.8%, MMLU: 91.8%, MGSM: 89.3%. o1-preview scores MGSM: 90.8%, MMLU: 90.8%, MATH: 85.5%, GPQA: 73.3%, LiveBench: 52.3%.

Is o1 cheaper than o1-preview?

Both models cost $15.00 per million input tokens.

What are the context window sizes for o1 and o1-preview?

o1 supports 200K tokens and o1-preview supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between o1 and o1-preview?

Key differences include LLM Stats Score (20.9 vs 16.6), context window (200K vs 128K). See the full comparison above for benchmark-by-benchmark results.

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