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by OpenAI

OpenAI: GPT-3.5 Turbo 16k.

text closed 16K ctx
Cheapest input
$3.0/M
on OpenAI API
Cheapest output
$4.0/M
on OpenAI API
Fastest
25 tok/s
on OpenRouter
Hosted equiv.
~$1.44/hr
@ 100 tok/s on OpenAI API

This model offers four times the context length of gpt-3.5-turbo, allowing it to support approximately 20 pages of text in a single request at a higher cost. Training data: up...

Hosted API only

No self-host path — closed weights.

OpenAI: GPT-3.5 Turbo 16k's weights aren't published. Use it via the access providers below.

Where to use it

Cheapest hosted endpoints.

Provider Access $/M in $/M out
OpenAI API api direct $3.0 $4.0 Launch ↗
OpenRouter api aggregator $3.0 $4.0 Launch ↗
Performance

Speed across providers.

Tokens/sec and time-to-first-token measured against the same prompt template on each provider's API.

Provider Tokens/sec TTFT Total
OpenRouter 25.0 3842 ms 4241 ms
FAQ

Frequently asked.

How do I run OpenAI: GPT-3.5 Turbo 16k?
OpenAI: GPT-3.5 Turbo 16k is a closed-source API model. The cheapest way to access it is through the API providers listed on this page (direct API, aggregators, and hosted chat UIs).
Where can I access OpenAI: GPT-3.5 Turbo 16k?
OpenAI: GPT-3.5 Turbo 16k is available via OpenAI API, OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run OpenAI: GPT-3.5 Turbo 16k?
API pricing starts at $3.0/M input tokens and $4.0/M output tokens. Self-hosting cost depends on the GPU you rent — see the Run It Yourself tab.
Is OpenAI: GPT-3.5 Turbo 16k open-source or proprietary?
OpenAI: GPT-3.5 Turbo 16k is a proprietary model from OpenAI. Access is API-only — there are no public weights to download.