# Kimi K3.1 Pro vs Step 3.7 Flash (slim)

> Step 3.7 Flash scores 59.8 (C) to Kimi K3.1 Pro's 48.6 (D) for open-weight models you run yourself. Prices, MCP, x402, uptime and agent notes side by side.

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Step 3.7 Flash scores 59.8 (C) on agent readiness against Kimi K3.1 Pro's 48.6 (D), and leads in 2 of 4 scored categories. Kimi K3.1 Pro leads on risk and documentation and upkeep. Both do open-weight models you run yourself.

- Kimi K3.1 Pro: D 48.6, rank #151 of 160 open-weight models · https://www.anchorterminal.com/tools/kimi-k3-1-pro.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 K3.1 Pro, good for Operators with a multi-accelerator node who want Moonshot's newest open-weight model for coding and long agent sessions, and everyone else through an API Ahead on Risk, 50 against 45; Documentation and upkeep, 51 against 39.
- 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 40; Agent interface, 85 against 65.

| Category | Kimi K3.1 Pro | Step 3.7 Flash |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 40 | 70 |
| Risk (20%) | 50 | 45 |
| Agent interface (10%) | 65 | 85 |
| Documentation and upkeep (10%) | 51 | 39 |

| Fact (where they differ) | Kimi K3.1 Pro | Step 3.7 Flash |
| --- | --- | --- |
| Vendor | Moonshot AI | StepFun |
| Licence | Kimi K3.1 Pro License (modified MIT) | Apache-2.0 (metadata and card; no LICENSE file) |
| Last release | 2026-11-05 | 2026-06-03 |

Why the edge:
- Reach, Step 3.7 Flash +30: Kimi K3.1 Pro 40 (Memory 0, the only build is Moonshot's 1,561 GB MXFP4 release, far above 256 GB.); 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…)
- Agent interface, Step 3.7 Flash +20: Kimi K3.1 Pro 65 (Chat template 10, the format is only code to run.); Step 3.7 Flash 85 (Chat template 20, chat_template.jinja in the repository (5,723 characters).)
- Documentation and upkeep, Kimi K3.1 Pro +12: Kimi K3.1 Pro 51 (Model card 11, no limitations, languages or cut-off.); Step 3.7 Flash 39 (Model card 14, Intended use, the architecture, the parameters, the context and the language (in the metadata) are on the card.)
- Risk, Kimi K3.1 Pro +5: Kimi K3.1 Pro 50 (File safety 15, safetensors only, less 10 for remote code and prompts built by the repository's script.); Step 3.7 Flash 45 (File safety 15, safetensors and GGUF only, no .bin, .pt or .pth files (25).)