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gpt-3.5-turbo-16k

Chat model by OpenAI.

Legacy 16K context variant of GPT-3.5 Turbo offering expanded token capacity for longer text processing tasks.

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Models / gpt-3.5-turbo-16kID: openai/gpt-3.5-turbo-16k

Maker

OpenAI

Served On: OpenAI API

Specifications

Context window, ranked against other chat models

Proportional scale: 0 to 1M tokens. Not ranked, no published context window: glm-5.3-prime, qwen3-235b-a22b-2507, qwen3.7-max-2026-05-17, llama4-maverick-17b-instruct.

Context window

—

Max output

—

Modality

chat

Vision
Function calling
System prompt

Pricing

Rates are read live

Pricing for gpt-3.5-turbo-16k 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-3.5-turbo-16k 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

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Start building with gpt-3.5-turbo-16k

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-3.5-turbo-16k
# 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-3.5-turbo-16k
claude --model openai/gpt-3.5-turbo-16k

FAQs

What is gpt-3.5-turbo-16k?

Legacy 16K context variant of GPT-3.5 Turbo offering expanded token capacity for longer text processing tasks.

How much does gpt-3.5-turbo-16k cost?

gpt-3.5-turbo-16k 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-3.5-turbo-16k support tool calling and structured outputs?

Yes. gpt-3.5-turbo-16k supports tool calling (function calling), so it can invoke external tools and APIs during a conversation.

What inputs and outputs does gpt-3.5-turbo-16k support?

gpt-3.5-turbo-16k takes text and images as input and returns text as output.

How do I use gpt-3.5-turbo-16k 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-3.5-turbo-16k". The quick-start panel above has a copy-paste curl command for this model.

When was gpt-3.5-turbo-16k released?

gpt-3.5-turbo-16k was released on June 13, 2023.

Where is the gpt-3.5-turbo-16k 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 Whisper 1 (nrouter.ai/models/whisper-1), o1 (nrouter.ai/models/o1), o3 Mini (nrouter.ai/models/o3-mini), GPT-5.5 Pro (nrouter.ai/models/gpt-5.5-pro).