UltraGPT
Anthropic: Claude Sonnet 4
Claude Sonnet 4 significantly enhances the capabilities of its predecessor, Sonnet 3.7, excelling in both coding and reasoning tasks with improved precision and controllability. Achieving state-of-the-art performance on SWE-bench (72.7%),...
Intelligence overview
1M tok
Context window
64K tok
Max output
What Anthropic: Claude Sonnet 4 can do.
Reasoning
Extended reasoning
Works through problems step by step before answering, trading latency for accuracy on harder tasks.
Multimodal
Image understanding
Reads and reasons over images alongside text in the same prompt.
File input
Reads uploaded files — documents, spreadsheets, code — directly in context.
Development
Tool calling
Calls external functions mid-response, then continues reasoning from the result.
Streaming
Streams tokens as they're generated instead of waiting on the full response.
Performance
Design Arena — ranked #59 across 7 categories
Pay for what you use.
Every model in UltraGPT runs behind one flat subscription — this is the underlying per-token cost the catalog tracks.
$3 / 1M tok
$15 / 1M tok
Built for serious work.
Build
Generate and refactor code, with the ability to run and verify tool calls.
Think
Works through multi-step problems with extended reasoning before it answers.
Research
Holds up to 1M tokens of source material in context without losing the thread.
Create
Reads images alongside a prompt to ground creative and design work in what's actually on screen.
Automate
Chains tool calls across multi-step workflows, reasoning between each one.
Ask Anthropic: Claude Sonnet 4 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 Anthropic: Claude Sonnet 4 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
- 1M tokens
- Max output
- 64K tokens
- Input modalities
- Image + Text + File
- Output modalities
- Text
- Knowledge cutoff
- Jan 31, 2025
- Release date
- May 22, 2025
- Streaming
- Supported
- Tool calling
- Supported
- JSON mode
- Not supported
More from Anthropic, and everything else.
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