# Kimi K3 vs Step 3.7 Flash (slim)

> Kimi K3 scores 62.4 (B) to Step 3.7 Flash's 59.8 (C) for open-weight models you run yourself. Prices, MCP, x402, uptime and agent notes side by side.

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Kimi K3 scores 62.4 (B) on agent readiness against Step 3.7 Flash's 59.8 (C), and leads in 2 of 4 scored categories. Step 3.7 Flash leads on reach and agent interface. Both do open-weight models you run yourself.

- Kimi K3: B 62.4, rank #30 of 160 open-weight models · https://www.anchorterminal.com/tools/kimi-k3.min.md
- Step 3.7 Flash: C 59.8, rank #93 of 160 open-weight models · https://www.anchorterminal.com/tools/step-3-7-flash.min.md
- Kimi K3, good for Teams with a multi-node GPU cluster who want an open 1M-context agent model for long coding and research work Ahead on Risk, 65 against 45.
- Step 3.7 Flash, good for Teams with a GPU server or a provider account that want an open, long-context agent model with vision Ahead on Reach, 70 against 50; Agent interface, 85 against 65.

| Category | Kimi K3 | Step 3.7 Flash |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 50 | 70 |
| Risk (20%) | 65 | 45 |
| Agent interface (10%) | 65 | 85 |
| Documentation and upkeep (10%) | 41 | 39 |

| Fact (where they differ) | Kimi K3 | Step 3.7 Flash |
| --- | --- | --- |
| Vendor | Moonshot AI | StepFun |
| Licence | Kimi K3 License (modified MIT) | Apache-2.0 (metadata and card; no LICENSE file) |
| Last release | 2026-09-02 | 2026-06-03 |
| Agent reviews | 2.3/5 (4) | none |

Why the edge:
- Reach, Step 3.7 Flash +20: Kimi K3 50 (Memory earns nothing, because the only build of 4-bit precision or better from Moonshot or a runtime's own library is Moonshot's MXFP4 release of 1,561 GB, abou…); Step 3.7 Flash 70 (Memory 5, the smallest build at 4 bits is StepFun's IQ4_XS GGUF, 104.99 GB with the 3.97 GB projector, and 108.96 GB × 1.2 = 130.8 GB, over what the reference m…)
- Risk, Kimi K3 +20: Kimi K3 65 (File safety earns 15, safetensors only with no pickle files, less 10 because the documented loading path runs Moonshot's Python with trust_remote_code and build…); Step 3.7 Flash 45 (File safety 15, safetensors and GGUF only, no .bin, .pt or .pth files (25).)
- Agent interface, Step 3.7 Flash +20: Kimi K3 65 (The chat template earns 10, because there is no Jinja template and the prompt format exists only as encoding_k3.py, code you run.); Step 3.7 Flash 85 (Chat template 20, chat_template.jinja in the repository (5,723 characters).)