# Gemini 4 Carbon vs xAI API (Grok) (slim)

> xAI scores 71.7 (BB) to Gemini 4 Carbon's 62.6 (B) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/gemini-4-carbon-vs-xai-api.md (~6,150 tokens) · this version ~880 tokens · JSON https://www.anchorterminal.com/compare/gemini-4-carbon-vs-xai-api.json · canonical https://www.anchorterminal.com/compare/gemini-4-carbon-vs-xai-api
- 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)

xAI API (Grok) scores 71.7 (BB) on agent readiness against Gemini 4 Carbon's 62.6 (B), and leads in 3 of 7 scored categories. Gemini 4 Carbon leads on maintenance & community and transparency & trust. Both do llm inference.

- Gemini 4 Carbon: B 62.6, rank #555 of 1518 · https://www.anchorterminal.com/tools/gemini-4-carbon.min.md
- xAI API (Grok): BB 71.7, rank #154 of 1518 · https://www.anchorterminal.com/tools/xai-api.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 Maintenance & community, 83 against 77; Transparency & trust, 72 against 63.
- xAI API (Grok), good for Agents that want a capable model at a low per-token price with built-in web and X search, remote MCP and voice, and teams that need self-serve ZDR or US-only processing. Ahead on Reliability, 55 against 40; Security & auth, 97 against 55. Also Agent-ready, a grade of BB or better.

| Category | Gemini 4 Carbon | xAI API (Grok) |
| --- | --- | --- |
| Reliability (16%) | 40 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 85 | 88 |
| Agent ergonomics (13%) | 93 | 90 |
| Security & auth (14%) | 55 | 97 |
| Payments & pricing (10%) | 20 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 83 | 77 |
| Transparency & trust (7%) | 72 | 63 |

| Fact (where they differ) | Gemini 4 Carbon | xAI API (Grok) |
| --- | --- | --- |
| Vendor | Google | SpaceXSI (xAI) |
| Hosted endpoint | `https://generativelanguage.googleapis.com/v1beta` | `https://api.x.ai/v1` |
| Transports |  | HTTP |
| Licence | Closed model, used through the Gemini API and Google's apps under Google's terms | Proprietary service under xAI's enterprise terms of service. The Python SDK is Apache-2.0 |
| Last release | 2026-11-10 | 2026-11-02 |
| Terms last updated | 2026-04-28 | 2026-10-27 |
| Privacy policy last updated | 2026-10-01 | 2026-10-27 |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | none | 597 stars, 912k PyPI/wk |

Why the edge:
- Security & auth, xAI API (Grok) +42: Gemini 4 Carbon 55 (Model reading for gemini-4-carbon on the Gemini API.); xAI API (Grok) 97 (Model reading.)
- Reliability, xAI API (Grok) +15: Gemini 4 Carbon 40 (Model reading for gemini-4-carbon on the Gemini API.); xAI API (Grok) 55 (Status page at status.x.ai with components for the global and US API endpoints, voice, the consumer apps and, since the Cursor merger, Cursor's services, with a…)
- Transparency & trust, Gemini 4 Carbon +9: Gemini 4 Carbon 72 (Model reading for gemini-4-carbon on the Gemini API.); xAI API (Grok) 63 (Closed service under xAI's enterprise terms, with the Python SDK under Apache-2.0 (15).)
- Maintenance & community, Gemini 4 Carbon +6: Gemini 4 Carbon 83 (Model reading for gemini-4-carbon on the Gemini API.); xAI API (Grok) 77 (Model reading.)