UltraGPT
Reflection: Beam 1.0 501B A23B
Beam 1.0 is Reflection's open-weight reasoning model for coding and long-horizon agentic workflows. It uses a sparse mixture-of-experts architecture with 501B total and 23B active parameters per token, and a...
Intelligence overview
1.05M tok
Context window
943.7K tok
Max output
What Reflection: Beam 1.0 501B A23B can do.
Reasoning
Extended reasoning
Works through problems step by step before answering, trading latency for accuracy on harder tasks.
Adjustable effort
Choose how much the model deliberates per request — trade speed for depth as the task demands.
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.
$1 / 1M tok
$3 / 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.
Think
Works through hard problems with adjustable reasoning effort — max, xhigh, high, medium, low.
Research
Holds up to 1.05M tokens of source material in context without losing the thread.
Automate
Chains tool calls across multi-step workflows, reasoning between each one.
Ask Reflection: Beam 1.0 501B A23B 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 Reflection: Beam 1.0 501B A23B 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
- 1.05M tokens
- Max output
- 943.7K tokens
- Input modalities
- Text
- Output modalities
- Text
- Knowledge cutoff
- Jun 30, 2026
- Release date
- Oct 16, 2026
- Reasoning effort
- max, xhigh, high, medium, low (always on)
- Streaming
- Supported
- Tool calling
- Supported
- JSON mode
- Supported
Reasoning
More from Reflection, 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.