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GPT-5

Reasoning model by OpenAI.

Multimodal reasoning model supporting text and image inputs with a 400,000-token context window and 128,000 max output tokens. It is designed for multi-step coding and mathematical derivation with a September 2024 knowledge cutoff.

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Models / GPT-5ID: openai/gpt-5

Maker

OpenAI

Served On: OpenAI

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

Pricing

Rates are read live

Pricing for gpt-5 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 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 gpt-5

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
# 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
claude --model openai/gpt-5

FAQs

What is GPT-5?

Multimodal reasoning model supporting text and image inputs with a 400,000-token context window and 128,000 max output tokens. It is designed for multi-step coding and mathematical derivation with a September 2024 knowledge cutoff.

How much does GPT-5 cost?

GPT-5 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 GPT-5 support tool calling and structured outputs?

Yes. GPT-5 supports tool calling (function calling), so it can invoke external tools and APIs during a conversation.

What inputs and outputs does GPT-5 support?

GPT-5 takes text and images as input and returns text as output.

How do I use GPT-5 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/gpt-5". The quick-start panel above has a copy-paste curl command for this model.

When was GPT-5 released?

GPT-5 was released on August 7, 2025.

Where is the GPT-5 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).