GPT-3.5 Turbo 16k
by OpenAIChatretires 2026-10-23
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 to Sep 2021.
- Context
- 16.4K tokens
- Max output
- 4,096 tokens
- Released
- 2023-08-28
- Weights
- Closed
openai/gpt-3-5-turbo-16k · also seen as gpt-35-turbo-16k
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2023-08-28
- Weights
- Closed
- Input
- Text, PDF
- Output
- Text
- Context window
- 16,385 max across endpoints
- Max output
- 4,096
- Providers
- 2 + 2 gateways, not counted as providers
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $3.00 in · $4.00 out per 1M tokens · 1 of 2 providers have a comparable price
More details
- Last updated
- 2023-08-28
- Knowledge cutoff
- 2021-09-30
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel toolsunknown
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web searchunknown
- Computer useunknown
- System messages
- Assistant prefillunknown
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Price history
No change since 19 Oct 2026. The cheapest direct price has been $3.00 in / $4.00 out per 1M tokens at OpenAI on every data refresh since then.
Tracked from 19 Oct 2026. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs GPT-3.5 Turbo 16k |
|---|---|---|---|---|---|
| Gemini 3 Pro PreviewGoogle | $3.30 | $1.80 | $10.80 | 1.05M | +4% |
| GPT-5.4OpenAI | $3.30 | $1.80 | $10.80 | 1.05M | +4% |
| GLM-4.5 XZ.ai (Zhipu AI) | $3.32 | $2.20 | $8.90 | 128K | +5% |
| GPT-4.1OpenAI | $3.00 | $2.00 | $8.00 | 1.05M | −5% cheaper |
| o3OpenAI | $3.00 | $2.00 | $8.00 | 200K | −5% cheaper |
| Perplexity Sonar Deep ResearchPerplexity | $3.00 | $2.00 | $8.00 | 128K | −5% cheaper |
| Sonar Reasoning ProPerplexity | $3.00 | $2.00 | $8.00 | 128K | −5% cheaper |
| Abliterated Model LargeAbliteration | $3.33 | $3.00 | $5.00 | 1M | +5% |
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