Model Comparison

o1 vs o1-previewWhich is better in 2026?

o1 shows notably better performance in the majority of benchmarks. o1 and o1-preview cost the same.

Verdict: o1 vs o1-preview — which is better?

o1 (by OpenAI) and o1-preview (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

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.

o1 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose o1 if…

  • you want the strongest raw capability — it leads on 6 of 8 shared benchmarks
  • 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 if…

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

Comparative analysis across standard metrics

8 benchmarks

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 Jun 24 2026 • llm-stats.com

Arena Performance

Human preference votes

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 Jun 24 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 Jun 24 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

1.5 years ago

3mo newer
o1-preview

Sep 12, 2024

1.8 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→

Key Takeaways

OpenAI
Larger context window (200,000 tokens)
Higher AIME 2024 score (74.3% vs 42.0%)
Higher GPQA score (78.0% vs 73.3%)
Higher LiveBench score (67.0% vs 52.3%)
Higher MATH score (96.4% vs 85.5%)
Higher MMLU score (91.8% vs 90.8%)
Higher SimpleQA score (47.0% vs 42.4%)
OpenAI
Higher MGSM score (90.8% vs 89.3%)
Higher SWE-Bench Verified score (41.3% vs 41.0%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
o1
OpenAI
o1-preview

FAQ

Common questions about o1 vs o1-preview.

Which is better, o1 or o1-preview?

o1 shows notably better performance in the majority of benchmarks. o1 is made by OpenAI and o1-preview is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities 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 context window (200K vs 128K). See the full comparison above for benchmark-by-benchmark results.

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