---
license: cc-by-4.0
tags:
  - cat-jam
  - beam
  - stealth-model
  - stealthmark
  - coding
  - reasoning
  - tool-use
  - long-context
thumbnail: https://stealthmodels.com/cat-jam/assets/social-card.png
new_version: reflection/Beam-1.0-501B-A23B
---

<a href="https://stealthmodels.com/cat-jam/?utm_source=huggingface&utm_medium=referral&utm_campaign=cat-jam-card"><img src="https://huggingface.co/stealth-model/cat-jam/resolve/main/panels/hero.webp" alt="Cat Jam Free, an ivory-white cat concentrating on the beat beside 1M context and free-preview labels."></a>

**Our token-count test matched Cat Jam to MISSINGNO. on all 24 phrases, a day before Reflection named both as previews of Beam.**

By [Stealth Models](https://stealthmodels.com/?utm_source=huggingface&utm_medium=referral&utm_campaign=cat-jam-card).

StealthMark results for the released Beam 1.0:

<a href="https://stealthmodels.com/benchmarks/models/beam-1.0-501b-a23b?utm_source=huggingface&utm_medium=referral&utm_campaign=cat-jam-card"><img src="https://huggingface.co/stealth-model/cat-jam/resolve/main/panels/verdict.webp" alt="StealthMark 1.8.8 results for the released Beam 1.0: benchmark score 31.9 out of 100, General Intelligence 30.9, Visual Intelligence 33.8. Beam, the model behind Cat Jam, is strongest at composing a whole scene: 52.4 on Beach."></a>

<a href="https://stealthmodels.com/benchmarks/models/beam-1.0-501b-a23b?utm_source=huggingface&utm_medium=referral&utm_campaign=cat-jam-card"><img src="https://huggingface.co/stealth-model/cat-jam/resolve/main/panels/results.webp" alt="Every StealthMark result of the released Beam 1.0: Beach 52.4, Foresight 49.4, Raccoon 46.3, Selfie 45.4, Latch 37.3, Ground Truth 27.9, Newton's Mirror 21.7, Mona Lisa 0.7."></a>

[See the token-count comparison](https://stealthmodels.com/cat-jam?utm_source=huggingface&utm_medium=referral&utm_campaign=cat-jam-card#tokenizer-details)

<a href="https://stealthmodels.com/cat-jam/?utm_source=huggingface&utm_medium=referral&utm_campaign=cat-jam-card"><img src="https://huggingface.co/stealth-model/cat-jam/resolve/main/panels/case.webp" alt="The case file. First seen 13 Oct 2026, revealed 16 Oct 2026, developer Reflection AI, context 1,048,576 tokens, input Text, tool calls Yes, speed in our tests unknown. 13 Oct 2026: Appears as a stealth model for fast agentic coding, with no developer named. 15 Oct 2026, our finding: Our token-count test matches its 24 counts to MISSINGNO. 16 Oct 2026: Reflection names the Cat Jam demo as a Beam preview and releases Beam 1.0 under Apache 2.0."></a>

[Compare Beam with MiMo-V2.6-Flash](https://stealthmodels.com/compare/beam-1.0-501b-a23b-vs-mimo-v2.6-flash?utm_source=huggingface&utm_medium=referral&utm_campaign=cat-jam-card)

<details><summary>Facts as text</summary>

| Fact | Value |
|---|---|
| First seen | 13 Oct 2026 |
| Revealed | 16 Oct 2026 |
| Developer | Reflection AI |
| Context | 1,048,576 tokens |
| Input | Text |
| Tool calls | Yes |
| Speed in our tests | unknown |
| Access | Preview ended; the released Beam is available |

</details>

## Run it
Cat Jam was a preview of Beam 1.0, which is open under Apache 2.0. Run it with [our GGUF files](https://huggingface.co/stealth-model/missingno): IQ2_XXS, 134 GB, for 192 GB machines or a 32 GB GPU with 128 GB of RAM.

---
[Model guide](https://stealthmodels.com/cat-jam/?utm_source=huggingface&utm_medium=referral&utm_campaign=cat-jam-card) · [StealthMark leaderboard](https://huggingface.co/spaces/stealth-model/stealthmark) · [Follow us](https://huggingface.co/stealth-model)<br>
Text and images: CC BY 4.0, stealthmodels.com.