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o1

Reasoning model by OpenAI.

December 17, 2024 checkpoint of OpenAI o1 with a 200K token context window and 100K output ceiling, ranking 146th on LM Arena text benchmark.

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Models / o1ID: openai/o1-2024-12-17

Maker

OpenAI

Served On: OpenAI

This model is deprecated

o1 has been deprecated. It is still served on nRouter and can still be called.

Caller Notice: To help identify integrations still relying on this model, all API responses now include x-nr-model-deprecated: true and Warning: 299 - "Model deprecated" headers.

Specifications

Context window, ranked against other reasoning models

Proportional scale: 0 to 200K tokens. Not ranked, no published context window: gpt-5.2-pro-2025-12-11, gpt-5.4-pro, grok-4-1-fast-non-reasoning, grok-4-1-fast-reasoning, gpt-5.2-pro.

Context window

—

Max output

—

Modality

reasoning

Vision
Function calling
System prompt

Benchmarks

LMSYS Chatbot Arena (text)Rank #191 · Score 1366
Source: huggingface.co · Leaderboard: 2026-10-152026-10-15

Pricing

Rates are read live

Pricing for o1-2024-12-17 is fetched from the live catalogue on load, so it is never served from a cache that could outlive a repricing.

Availability

Not enough data yet

We have not collected enough health probes for this model to publish an uptime or latency figure. A percentage from a handful of samples is fabricated precision, so none is shown until the sample count supports one.

How o1 is billed

Billed at the provider's list price, with no per-token markup.

Exact list price
Tokens settle at the published rate of the model that served your call.
Cache discounts passed through
Provider prompt-caching discounts reach your balance with no added fee.
Cost on every response
Each response carries the x-nr-request-cost header, so you can reconcile spend per request.

More from OpenAI

gpt-oss-120b-1gpt-6.1-solgpt-5.2-pro-2025-12-11gpt-audio-1.5

Start building with o1-2024-12-17

One API key, three steps. Choose your tool to begin.

  1. Get a key

    Create API key

  2. Set your API key

    export NROUTER_API_KEY="<YOUR_API_KEY>"

  3. Configure Claude Code

    Choose a tool, then copy its setup from the panel.

npm install -g @anthropic-ai/claude-code
Claude Code · openai/o1-2024-12-17
# Point Claude Code to nRouter gateway
export ANTHROPIC_BASE_URL="https://api.nrouter.ai"
export ANTHROPIC_API_KEY="$NROUTER_API_KEY"

# Launch with openai/o1-2024-12-17
claude --model openai/o1-2024-12-17

FAQs

What is o1?

December 17, 2024 checkpoint of OpenAI o1 with a 200K token context window and 100K output ceiling, ranking 146th on LM Arena text benchmark.

How much does o1 cost?

o1 is billed at the provider's list price on nRouter with no per-token markup — tokens settle at the exact upstream rate. Input and output rates are read live, so see the pricing section above for the current figures.

Does o1 support tool calling and structured outputs?

Yes. o1 supports tool calling (function calling), so it can invoke external tools and APIs during a conversation.

What inputs and outputs does o1 support?

o1 takes text and images as input and returns text as output.

How do I use o1 via nRouter?

Use any OpenAI-compatible client: point it at https://api.nrouter.ai/v1 with your nRouter API key and set the model to "openai/o1-2024-12-17". The quick-start panel above has a copy-paste curl command for this model.

When was o1 released?

o1 was released on December 17, 2024.

Where is the o1 documentation?

Start at nrouter.ai/docs. The quick-start guide (nrouter.ai/docs/getting-started/quick-start) covers API keys and your first request, and the API reference (nrouter.ai/docs/api-reference) lists every parameter.

What other text models does OpenAI have?

Other OpenAI text models on nRouter include GPT-OSS 120B 1 (nrouter.ai/models/gpt-oss-120b-1), GPT-6.1 Sol (nrouter.ai/models/gpt-6.1-sol), GPT-5.2 Pro (nrouter.ai/models/gpt-5.2-pro-2025-12-11), GPT Audio 1.5 (nrouter.ai/models/gpt-audio-1.5).