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OpenAI: o1

openai/o1

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The latest and strongest model family from OpenAI, o1 is designed to spend more time thinking before responding. The o1 model series is trained with large-scale reinforcement learning to reason using chain of thought.

The o1 models are optimized for math, science, programming, and other STEM-related tasks. They consistently exhibit PhD-level accuracy on benchmarks in physics, chemistry, and biology. Learn more in the launch announcementOpens in new tab.

Modalities

In / Out Price

$15 / $60per 1M

Context

200K

Released

Dec 17, 2024

Knowledge Cutoff

Oct 2023

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ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

Providers

This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make.

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

Benchmark score summary for OpenAI: o1 (Artificial Analysis)
SourceBenchmarkScore
Artificial Analysiso1 Coding Index39.7
Artificial Analysiso1 GPQA Diamond74.7%
Artificial Analysiso1 HLE7.0%
Artificial Analysiso1 IFBench70.3%
Artificial Analysiso1 τ²-Bench Telecom62.6%
Artificial Analysiso1 AA-LCR65.0%
Artificial Analysiso1 CritPt0.3%
Artificial Analysiso1 Terminal-Bench Hard12.9%
Artificial Analysiso1 AA-Omniscience Accuracy34.5%
Artificial Analysiso1 AA-Omniscience Non-Hallucination Rate30.4%
Artificial Analysiso1-preview Coding Index34.0
Artificial Analysiso1-preview GPQA Diamond76.5%

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

Quick Start

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

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Frequently asked questions

The latest and strongest model family from OpenAI, o1 is designed to spend more time thinking before responding. The o1 model series is trained with large-scale reinforcement learning to reason using chain of thought. The o1 models are optimized for math, science, programming, and other STEM-related tasks.

o1 costs $15.00/M input tokens and $60.00/M output tokens, with separate rates for Cache Read at $7.50/M tokens.

o1 has a 200,000 token context window. It supports up to 100,000 completion tokens.

Yes. o1 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

o1 accepts text, images and files such as PDFs as input and returns text.

GPT-6 Astra, GPT-6 Astra Pro, GPT-5.6 Luna Pro and 55 more are other text models from OpenAI.

o1 was released on December 17, 2024. Its knowledge cutoff is October 31, 2023.