Models / o1ID: openai/o1
reasoning model by OpenAI

o1

Full-scale OpenAI reasoning model trained with reinforcement learning to generate detailed chains of thought for STEM, logic, and coding problems.

Certified & verified by nRouter· facts checked 2026-09-14 against 2 official sources

PlaygroundQuick Start
Context window200K
Max output100K
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 1.05M tokens. Not ranked, no published context window: gpt-5.5-pro, gpt-5.6-cyber.

Context window

200.0K

Source: platform.openai.com
Max output

100K

Source: platform.openai.com
Modality

reasoning

Vision
Function calling
System prompt

Benchmarks & Performance Rankings

Empirical intelligence benchmarks and category leaderboard placements for o1.

Compare in BenchmarksLeaderboard
Leaderboard Placements
#23
overallScore: 94.6%
#13
agentScore: 95%
#8
textScore: 97%
#11
webdevScore: 96%
#4
codingScore: 97.8%
#1
reasoningScore: 99.5%
#14
speedScore: 89%
#7
long contextScore: 95.5%
Core Benchmark DimensionsSource: OpenAI Frontier Evaluation
MMLUKnowledge

91.8%

HumanEvalCoding

92.4%

Latency p50TTFT

1850ms

p99: 5200ms

ThroughputStream

62tok/s

SWE-bench: 48.9%

Recommended by nRouter Smart Routing: Hard scientific logic and algorithmic challenge solving. Key operational strength: World-class mathematical and autonomous logic.

Benchmarks

not listed under this exact id on arena.ai text leaderboard (2026-09-11); listed variant: o1-2024-12-17 rank 146

Pricing

Rates are read live

Pricing for o1 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-5.6-lunagpt-5.5-progpt-4o-minigpt-5.4

Start building with o1

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
# 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
claude --model openai/o1