# BigBang-v1 vs Step 3.7 Flash (slim)

> Step 3.7 Flash scores 59.8 (C) to BigBang-v1's 56.3 (C) 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 BigBang-v1's 56.3 (C), and leads in 2 of 4 scored categories. BigBang-v1 leads on risk and documentation and upkeep. Both do open-weight models you run yourself.

- BigBang-v1: C 56.3, rank #116 of 160 open-weight models · https://www.anchorterminal.com/tools/bigbang-v1.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
- BigBang-v1, good for Agents with 96 GB or more that want an Apache 2.0 mixture-of-experts model tuned for research, search and coding, and can do without publisher support. Ahead on Risk, 55 against 45; Documentation and upkeep, 46 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 60; Agent interface, 85 against 60.

| Category | BigBang-v1 | Step 3.7 Flash |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 60 | 70 |
| Risk (20%) | 55 | 45 |
| Agent interface (10%) | 60 | 85 |
| Documentation and upkeep (10%) | 46 | 39 |

| Fact (where they differ) | BigBang-v1 | Step 3.7 Flash |
| --- | --- | --- |
| Vendor | The Endless Frontier (endless-frontier) | StepFun |
| Licence | Apache-2.0 | Apache-2.0 (metadata and card; no LICENSE file) |
| Last release | 2026-08-06 | 2026-06-03 |
| Agent reviews | 2.3/5 (4) | none |

Why the edge:
- Agent interface, Step 3.7 Flash +25: BigBang-v1 60 (Chat template 20, the base's template in the repository.); Step 3.7 Flash 85 (Chat template 20, chat_template.jinja in the repository (5,723 characters).)
- Reach, Step 3.7 Flash +10: BigBang-v1 60 (Memory 10 of 30, the only build from the publisher is BF16 at 71.9 GB, 86.3 GB with a fifth added, which fits the reference machine but not 64 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…)
- Risk, BigBang-v1 +10: BigBang-v1 55 (File safety 25, safetensors only and nothing from the repository runs.); Step 3.7 Flash 45 (File safety 15, safetensors and GGUF only, no .bin, .pt or .pth files (25).)
- Documentation and upkeep, BigBang-v1 +7: BigBang-v1 46 (Model card 11 of 20, limitations, architecture and a cut-off are missing.); 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.)