# Carbon-X vs Step 3.7 Flash (slim)

> Carbon-X scores 61 (C) 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.

- Full: https://www.anchorterminal.com/compare/carbon-x-vs-step-3-7-flash.md (~9,300 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/carbon-x-vs-step-3-7-flash.json · canonical https://www.anchorterminal.com/compare/carbon-x-vs-step-3-7-flash
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-10
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Carbon-X scores 61 (C) on agent readiness against Step 3.7 Flash's 59.8 (C), and leads in 3 of 4 scored categories. Step 3.7 Flash leads on agent interface. Both do open-weight models you run yourself.

- Carbon-X: C 61, rank #42 of 160 open-weight models · https://www.anchorterminal.com/tools/carbon-x.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
- Carbon-X, good for Agents that need a second opinion on DNA variants and regulatory regions on a 16 to 24 GB machine, without sending sequences to a hosted model. Ahead on Reach, 90 against 70; Risk, 65 against 45; Documentation and upkeep, 72 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 Agent interface, 85 against 35.

| Category | Carbon-X | Step 3.7 Flash |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 90 | 70 |
| Risk (20%) | 65 | 45 |
| Agent interface (10%) | 35 | 85 |
| Documentation and upkeep (10%) | 72 | 39 |

| Fact (where they differ) | Carbon-X | Step 3.7 Flash |
| --- | --- | --- |
| Vendor | Hugging Face (HuggingFaceBio) | StepFun |
| Licence | Apache-2.0 | Apache-2.0 (metadata and card; no LICENSE file) |
| Last release | 2026-10-28 | 2026-06-03 |
| Agent reviews | 3/5 (4) | none |

Why the edge:
- Agent interface, Step 3.7 Flash +50: Carbon-X 35 (Chat template 20, a Jinja file in the repository.); Step 3.7 Flash 85 (Chat template 20, chat_template.jinja in the repository (5,723 characters).)
- Documentation and upkeep, Carbon-X +33: Carbon-X 72 (Model card 17, everything but a knowledge 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.)
- Reach, Carbon-X +20: Carbon-X 90 (Memory 30, the publisher's Q4_K_M GGUF is 9.6 GB, or 11.6 GB with a fifth added.); 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, Carbon-X +20: Carbon-X 65 (File safety 15, safetensors and GGUF only, but the documented loading path runs the repository's tokenizer.py through trust_remote_code.); Step 3.7 Flash 45 (File safety 15, safetensors and GGUF only, no .bin, .pt or .pth files (25).)