GPT-3.5 Turbo 16k

OpenAI · Released August 2023 · Knowledge cutoff September 2021

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.

It is part of OpenAI's GPT family, where GPT-6 Astra leads, GPT-6 Sol and GPT-6 Luna cover the capability and speed tiers below it, the GPT-5.6 generation sits behind them, and Pro servings trade speed for deeper computation.

Facts and pricing

Provider

OpenAI

Context window

16K tokens

Input price

36.0 credits / 1M tokens ($3.00 raw)

Output price

48.0 credits / 1M tokens ($4.00 raw)

Vision (image input)

No

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.

Try GPT-3.5 Turbo 16k now

What GPT-3.5 Turbo 16k is best for

• High-volume everyday tasks where speed and cost matter: summaries, drafts, quick questions
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a fast and light model like GPT-3.5 Turbo 16k:

• Summarize this article in five bullet points
• Rewrite this email to be shorter and friendlier
• Give me ten name ideas for a hiking newsletter
• Translate this paragraph to Spanish and keep the tone

OpenAI family

All 71 OpenAI models

Model comparisons

• Claude Opus 5.5 vs GPT-6 Astra
• Claude Opus 5.5 vs GPT-6 Sol
• GPT-6 Sol vs GPT-5.6 Sol
• GPT-6 Sol vs GPT-6 Astra

Frequently asked questions

What is GPT-3.5 Turbo 16k?

GPT-3.5 Turbo 16k is an AI model by OpenAI. 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.

How much does GPT-3.5 Turbo 16k cost on Zeplik?

Input tokens cost 36.0 credits per million and output tokens 48.0 credits per million (1 credit = $0.10; the raw provider rates are $3.00 and $4.00 per million). New accounts start with free credits.

How long can a conversation with GPT-3.5 Turbo 16k be?

GPT-3.5 Turbo 16k has a 16K-token context window (16,385 tokens), which covers the conversation plus any documents you attach.

Does GPT-3.5 Turbo 16k support images and tools?

GPT-3.5 Turbo 16k is text-only and supports tool calling.

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