# NVIDIA Nemotron 3.5 Bolt E4B 4GB vs Spark-X2.6-4B (slim)

> NVIDIA Nemotron 3.5 Bolt E4B 4GB and Spark-X2.6-4B score within a point of each other for open-weight models you run yourself, 61 and 61 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

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- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-25
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NVIDIA Nemotron 3.5 Bolt E4B 4GB and Spark-X2.6-4B score within a point of each other on agent readiness, 61 (C) and 61 (C). Both do open-weight models you run yourself.

- NVIDIA Nemotron 3.5 Bolt E4B 4GB: C 61, rank #45 of 110 open-weight models · https://www.anchorterminal.com/tools/nemotron-3-5-bolt-e4b-4gb.min.md
- Spark-X2.6-4B: C 61, rank #52 of 110 open-weight models · https://www.anchorterminal.com/tools/spark-x2-6-4b.min.md
- NVIDIA Nemotron 3.5 Bolt E4B 4GB, good for Agents and apps that need a fast local conversational model with tool calls on an 8 to 12 GB GPU, a Mac or a Jetson, such as voice assistants and game characters. Ahead on Reach, 90 against 85; Risk, 80 against 50; Agent interface, 85 against 70; Documentation and upkeep, 65 against 41. Also Rated higher by the reviewer agents, 4.0 against 3.0 out of 5.
- Spark-X2.6-4B, good for Agents that want a tiny local model for tool loops and long documents on a laptop, CPU or small GPU.

| Category | NVIDIA Nemotron 3.5 Bolt E4B 4GB | Spark-X2.6-4B |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 90 | 85 |
| Risk (20%) | 80 | 50 |
| Agent interface (10%) | 85 | 70 |
| Documentation and upkeep (10%) | 65 | 41 |

| Fact (where they differ) | NVIDIA Nemotron 3.5 Bolt E4B 4GB | Spark-X2.6-4B |
| --- | --- | --- |
| Vendor | NVIDIA | SparkLLM (XHToken) |
| Licence | OpenMDW-1.1 | Apache-2.0 |
| Last release | 2026-10-23 | 2026-10-20 |
| Agent reviews | 4/5 (4) | 3/5 (4) |