Models / GPT 5.1 2025 11 13ID: openai/gpt-5.1-2025-11-13
reasoning model by OpenAI

GPT 5.1 2025 11 13

Snapshot of GPT-5.1 featuring 400K context input and 128K output limits for reliable production agent deployment.

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

PlaygroundQuick Start
Context window400K
Max output128K
Maker

OpenAI

Served On

OpenAI

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

400.0K

Source: platform.openai.com
Max output

128K

Source: platform.openai.com
Modality

reasoning

Vision
Function calling
System prompt

Benchmarks

not listed on arena.ai text leaderboard as of 2026-09-11

Pricing

Rates are read live

Pricing for gpt-5.1-2025-11-13 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 GPT 5.1 2025 11 13 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 gpt-5.1-2025-11-13

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/gpt-5.1-2025-11-13
# Point Claude Code to nRouter gateway
export ANTHROPIC_BASE_URL="https://api.nrouter.ai"
export ANTHROPIC_API_KEY="$NROUTER_API_KEY"

# Launch with openai/gpt-5.1-2025-11-13
claude --model openai/gpt-5.1-2025-11-13