# Gemini 4 Carbon vs Muse Spark Open (slim)

> Gemini 4 Carbon scores 62.6 (B) to Muse Spark Open's 53.4 (D) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/gemini-4-carbon-vs-muse-spark-open.md (~7,300 tokens) · this version ~1,030 tokens · JSON https://www.anchorterminal.com/compare/gemini-4-carbon-vs-muse-spark-open.json · canonical https://www.anchorterminal.com/compare/gemini-4-carbon-vs-muse-spark-open
- 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
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Gemini 4 Carbon scores 62.6 (B) on agent readiness against Muse Spark Open's 53.4 (D), and leads in 5 of 7 scored categories. Muse Spark Open leads on payments & pricing. Both do llm inference.

- Gemini 4 Carbon: B 62.6, rank #555 of 1518 · https://www.anchorterminal.com/tools/gemini-4-carbon.min.md
- Muse Spark Open: D 53.4, rank #955 of 1518 · https://www.anchorterminal.com/tools/muse-spark-open.min.md
- Gemini 4 Carbon, good for Agents on the hardest long tasks (multi-step debugging, large codebases, open-ended research, security work) that can pay frontier prices and already use the Gemini API. Ahead on Schema & documentation, 85 against 61; Agent ergonomics, 93 against 69; Security & auth, 55 against 44; Maintenance & community, 83 against 60; Transparency & trust, 72 against 53. Also A hosted endpoint, with nothing to install.
- Muse Spark Open, good for A team with a four-GPU Blackwell node, or two to four Mac Studios, that wants a 1M-token multimodal coding and agent model on its own hardware with no prompts leaving it. Ahead on Payments & pricing, 50 against 20. Also No key needed to call it.

| Category | Gemini 4 Carbon | Muse Spark Open |
| --- | --- | --- |
| Reliability (16%) | 40 | 42 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 85 | 61 |
| Agent ergonomics (13%) | 93 | 69 |
| Security & auth (14%) | 55 | 44 |
| Payments & pricing (10%) | 20 | 50 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 83 | 60 |
| Transparency & trust (7%) | 72 | 53 |

| Fact (where they differ) | Gemini 4 Carbon | Muse Spark Open |
| --- | --- | --- |
| Vendor | Google | Meta |
| Hosted endpoint | `https://generativelanguage.googleapis.com/v1beta` | no (local only) |
| Transports |  | HTTP |
| Auth | API key | None |
| Pricing | Pay per use | Free |
| Licence | Closed model, used through the Gemini API and Google's apps under Google's terms | Muse Model Licence (source-available weights, not an OSI licence), free of charge with an attribution notice, a separate agreement with Meta before Model as a Service by a licensee group above $20M gross revenue, and the Muse Spark Open Usage Policy |
| Last release | 2026-11-10 | 2026-10-15 |
| Terms last updated | 2026-04-28 | 2026-10-15 |
| Privacy policy last updated | 2026-10-01 | no document linked |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |

Why the edge:
- Payments & pricing, Muse Spark Open +30: Gemini 4 Carbon 20 (Model reading for gemini-4-carbon on the Gemini API.); Muse Spark Open 50 (Self-hosted rule.)
- Schema & documentation, Gemini 4 Carbon +24: Gemini 4 Carbon 85 (Model reading for gemini-4-carbon on the Gemini API.); Muse Spark Open 61 (Read for a model the owner serves.)
- Agent ergonomics, Gemini 4 Carbon +24: Gemini 4 Carbon 93 (Model reading for gemini-4-carbon on the Gemini API.); Muse Spark Open 69 (Model reading of the checklist (tool use, structured output, caching, context, throughput, defaults and SDKs, errors).)
- Maintenance & community, Gemini 4 Carbon +23: Gemini 4 Carbon 83 (Model reading for gemini-4-carbon on the Gemini API.); Muse Spark Open 60 (Read for an open-weight model released three weeks ago.)
- Transparency & trust, Gemini 4 Carbon +19: Gemini 4 Carbon 72 (Model reading for gemini-4-carbon on the Gemini API.); Muse Spark Open 53 (Weights are downloadable under the Muse Model Licence, which is clear and broad in its grant but not an OSI licence.)
- Security & auth, Gemini 4 Carbon +11: Gemini 4 Carbon 55 (Model reading for gemini-4-carbon on the Gemini API.); Muse Spark Open 44 (Read as software the owner runs.)