Chat Latest (GPT-5.5 Instant): API pricing, providers and specs
Chat Latest (GPT-5.5 Instant) is a text model by OpenAI. 2 providers serve it, from $30 to $31.74 /1M; the lowest price is at ZenMux.
How Chat Latest (GPT-5.5 Instant) compares
Against the 737 text models on the site priced the same way.
- Pricey for its class: at $30 /1M, its lowest price is above 96% of comparable models (median $1.10).
- Its 400K-token context window is larger than 62% of them (median 262K), about 600 pages of text.
- On LMArena's Text board it ranks #28 of the 120 comparable models scored there.
- 2 providers serve it; 36% of comparable models have fewer.
Chat Latest (GPT-5.5 Instant) prices by provider
Every provider's list price, read from its own price page or API. A price marked “from” changes with context length, resolution or mode.
| Provider | Input | Output | Prompt caching | Context |
|---|---|---|---|---|
| ZenMux | $5/1M | $30/1M | $0.50/1M | 400K |
| AI/ML API | $5.29/1M | $31.74/1M | $0.529/1M | — |
Specs
- Type
- Text
- Maker
- OpenAI
- Inputs
- Image, Text
- Outputs
- Text
- Context
- 400K≈ 600 pages of text
- Max output
- 128K
- Capabilities
- Prompt caching, Vision
- Released
- May 5, 2026
- License
- —
- Open weights
- —
- Arena score
- 1419Text
Alternatives to Chat Latest (GPT-5.5 Instant)
Same kind of model from other makers, at a similar price.
| Model | Lowest price | Context | Arena | Providers |
|---|---|---|---|---|
| Chat Latest (GPT-5.5 Instant)this model | $30/1M | 400K | 1419 | 2 |
 Muse Wonder | $16/1M | 1.05M | — | 14 |
| Claude Opus 5.5 | $16/1M | 1M | 1807 | 33 |
| Claude-Sonnet-3.5 | $15/1M | — | 1298 | 1 |
| Claude Opus 5 | $20/1M | 1M | 1690 | 32 |
| Claude Sonnet 4.6 | $12/1M | 1M | 1523 | 31 |
| Claude Fable 5 | $40/1M | 1M | 1624 | 30 |
| Claude Fable 5.1 | $40/1M | 1M | 1743 | 29 |
 Gemini 3 Pro | $12/1M | — | 1479 | 1 |
More from OpenAI
Chat Latest (GPT-5.5 Instant) FAQ
The lowest price for Chat Latest (GPT-5.5 Instant) is $30 /1M, at ZenMux.
ZenMux, at $30 /1M. 2 providers serve Chat Latest (GPT-5.5 Instant); the table above lists every one with its price.
Chat Latest (GPT-5.5 Instant) reads up to 400K tokens per request and writes up to 128K.
We have not found Chat Latest (GPT-5.5 Instant)'s weights published by its maker.
2 API providers serve Chat Latest (GPT-5.5 Instant). Compare their prices above, or open a provider to see everything it offers.
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