UltraGPT
OpenAI: GPT-4 Turbo Preview
The preview GPT-4 model with improved instruction following, JSON mode, reproducible outputs, parallel function calling, and more. Training data: up to Dec 2023. **Note:** heavily rate limited by OpenAI while...
Intelligence overview
128K tok
Context window
4.1K tok
Max output
What OpenAI: GPT-4 Turbo Preview can do.
Development
Tool calling
Calls external functions mid-response, then continues reasoning from the result.
Structured output
Returns responses constrained to a JSON schema, ready to parse without cleanup.
Streaming
Streams tokens as they're generated instead of waiting on the full response.
Pay for what you use.
Every model in UltraGPT runs behind one flat subscription — this is the underlying per-token cost the catalog tracks.
$10 / 1M tok
$30 / 1M tok
Built for serious work.
Build
Generate and refactor code, with the ability to run and verify tool calls and return structured, parseable output.
Research
Holds up to 128K tokens of source material in context without losing the thread.
Ask OpenAI: GPT-4 Turbo Preview anything.
A preview of the real UltraGPT composer — the model you see here is the model you get.
Continues in the UltraGPT app — one login, every model.
How OpenAI: GPT-4 Turbo Preview stacks up.
The closest models in the catalog by provider, capability and score — real entries, pulled from the same directory.
Technical details.
Specification
- Context window
- 128K tokens
- Max output
- 4.1K tokens
- Input modalities
- Text
- Output modalities
- Text
- Knowledge cutoff
- Dec 31, 2023
- Release date
- Jan 25, 2024
- Streaming
- Supported
- Tool calling
- Supported
- JSON mode
- Supported
More from OpenAI, and everything else.
This model is one entry in the full UltraGPT catalog — browse the rest, compare pricing and context windows, or filter by capability.