# Claude Fable 5.2 vs xAI API (Grok) (slim)

> Claude Fable 5.2 scores 77.3 (BB) to xAI's 71.7 (BB) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/claude-fable-5-2-vs-xai-api.md (~6,950 tokens) · this version ~980 tokens · JSON https://www.anchorterminal.com/compare/claude-fable-5-2-vs-xai-api.json · canonical https://www.anchorterminal.com/compare/claude-fable-5-2-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: 2026-11-09
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Claude Fable 5.2 scores 77.3 (BB) on agent readiness against xAI API (Grok)'s 71.7 (BB), and leads in 6 of 7 scored categories. xAI API (Grok) leads on security & auth. Both do llm inference.

- Claude Fable 5.2: BB 77.3, rank #35 of 1517 · https://www.anchorterminal.com/tools/claude-fable-5-2.min.md
- xAI API (Grok): BB 71.7, rank #154 of 1517 · https://www.anchorterminal.com/tools/xai-api.min.md
- Claude Fable 5.2, good for Agents doing long, hard work (large coding changes, multi-step research, computer use) that can pay frontier prices, accept 30-day retention and don't need to force a tool call. Ahead on Reliability, 60 against 55; Agent ergonomics, 95 against 90; Payments & pricing, 30 against 20; Maintenance & community, 91 against 77; Transparency & trust, 85 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 Security & auth, 97 against 92.

| Category | Claude Fable 5.2 | xAI API (Grok) |
| --- | --- | --- |
| Reliability (16%) | 60 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 90 | 88 |
| Agent ergonomics (13%) | 95 | 90 |
| Security & auth (14%) | 92 | 97 |
| Payments & pricing (10%) | 30 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 91 | 77 |
| Transparency & trust (7%) | 85 | 63 |

| Fact (where they differ) | Claude Fable 5.2 | xAI API (Grok) |
| --- | --- | --- |
| Vendor | Anthropic | SpaceXSI (xAI) |
| Hosted endpoint | `https://api.anthropic.com/v1` | `https://api.x.ai/v1` |
| Transports |  | HTTP |
| Licence | Closed model, used through the Claude API and cloud platforms under Anthropic's Commercial Terms of Service | Proprietary service under xAI's enterprise terms of service. The Python SDK is Apache-2.0 |
| Last release | 2026-11-09 | 2026-11-02 |
| Terms last updated | no date given | 2026-10-27 |
| Privacy policy last updated | no date given | 2026-10-27 |
| Customer content may train models | yes, with an opt-out | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Popularity | none | 597 stars, 912k PyPI/wk |

Why the edge:
- Transparency & trust, Claude Fable 5.2 +22: Claude Fable 5.2 85 (Model reading for claude-fable-5-2 on the Claude API.); xAI API (Grok) 63 (Closed service under xAI's enterprise terms, with the Python SDK under Apache-2.0 (15).)
- Maintenance & community, Claude Fable 5.2 +14: Claude Fable 5.2 91 (Model reading for claude-fable-5-2 on the Claude API.); xAI API (Grok) 77 (Model reading.)
- Payments & pricing, Claude Fable 5.2 +10: Claude Fable 5.2 30 (Model reading for claude-fable-5-2 on the Claude API.); xAI API (Grok) 20 (No x402, MPP or L402 (0).)
- Reliability, Claude Fable 5.2 +5: Claude Fable 5.2 60 (Model reading for claude-fable-5-2 on the Claude 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…)
- Agent ergonomics, Claude Fable 5.2 +5: Claude Fable 5.2 95 (Model reading for claude-fable-5-2 on the Claude API.); xAI API (Grok) 90 (Model reading of the checklist (tool use, structured output, caching, context, batch, SDKs, errors).)
- Security & auth, xAI API (Grok) +5: Claude Fable 5.2 92 (Model reading for claude-fable-5-2 on the Claude API.); xAI API (Grok) 97 (Model reading.)