Reflection AI / reflection/beam-1.0-501b-a23b
Beam 1.0 501B A23B - access through LLMTR
Beam 1.0 is Reflection AI's mixture-of-experts (MoE) model for coding, reasoning and agentic workloads, with 501 billion total and 23 billion active parameters. Its context window is 1,048,576 tokens and it accepts text only. Tool calling and structured output with JSON Schema are supported. The model reasons before every answer and reasoning cannot be turned off; reasoning_effort selects low, medium, high, xhigh or max, and max applies when it is omitted. Reasoning tokens count toward the output limit; without max_tokens a single response can run to 32,768 tokens, so set your own limit with long prompts. The stop and seed parameters have no effect. It is free with a daily quota until 22 October 2026, 23:59 (TRT).
Technical specifications
| Canonical ID | reflection/beam-1.0-501b-a23b |
|---|---|
| Provider | Reflection AI |
| Context window | 1,048,576 tokens |
| Operations | CHAT_COMPLETIONS |
| Modalities | text |
Pricing
An 8% platform margin applies to credit top-ups; model usage prices are not separately marked up.
| Operation | Metric | Unit | Price |
|---|---|---|---|
| CHAT_COMPLETIONS | INPUT_TEXT | PER_1M_TOKENS | Not available |
| CHAT_COMPLETIONS | OUTPUT_TEXT | PER_1M_TOKENS | Not available |
Example usage
With existing OpenAI SDK flows, change only the base URL and model identifier.
curl https://llmtr.com/v1/chat/completions -H "Authorization: Bearer llmtr-your_key" -H "Content-Type: application/json" -d '{"model":"reflection/beam-1.0-501b-a23b","messages":[{"role":"user","content":"Hello"}]}'Guides about this model
- Models added to LLMTR in October 2026: facts and guide - Eight of the models LLMTR added in October 2026 in one table: Glimpse, Muse Spark Open, Nemotron 3.5 Super VL (paid and free rows), Moondream 3.1, EmbeddingMagibu 200M, the two decision models on /v1/systemone and Beam 1.0, free until 22 October 2026, 23:59 (Turkey time). All are called at https://llmtr.com/v1 with the same key; the free Qwen3.8 27B row, added earlier, is listed next to them.
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