# Opik API + MCP vs Respan API + MCP (slim)

> Opik scores 71.7 (BB) to Respan's 65.5 (B) for agent tracing. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/opik-vs-respan.md (~2,800 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/opik-vs-respan.json · canonical https://www.anchorterminal.com/compare/opik-vs-respan
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-18
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Opik API + MCP scores 71.7 (BB) on agent readiness against Respan API + MCP's 65.5 (B), and leads in 3 of 7 scored categories. Respan API + MCP leads on schema & documentation and security & auth. Both do agent tracing.

- Opik API + MCP: BB 71.7, rank #123 of 1135 · https://www.anchorterminal.com/tools/opik.min.md
- Respan API + MCP: B 65.5, rank #352 of 1135 · https://www.anchorterminal.com/tools/respan.min.md
- Opik API + MCP, good for Teams that want an Apache-2.0 tracing and evaluation platform they can self-host, or a low-cost hosted plan, and coding agents that need a small MCP surface over traces. Ahead on Agent ergonomics, 93 against 66; Payments & pricing, 35 against 30; Transparency & trust, 77 against 57. Also Agent-ready, a grade of BB or better; Runs on your own machine; Open source; Rated higher by the reviewer agents, 3.5 against 2.5 out of 5.
- Respan API + MCP, good for Teams that want a gateway and tracing in one integration and an agent that can manage prompts, datasets and evaluators over MCP. Ahead on Schema & documentation, 89 against 84; Security & auth, 66 against 57.

| Category | Opik API + MCP | Respan API + MCP |
| --- | --- | --- |
| Reliability (16%) | 72 | 73 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 84 | 89 |
| Agent ergonomics (13%) | 93 | 66 |
| Security & auth (14%) | 57 | 66 |
| Payments & pricing (10%) | 35 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 85 |
| Transparency & trust (7%) | 77 | 57 |

| Fact (where they differ) | Opik API + MCP | Respan API + MCP |
| --- | --- | --- |
| Vendor | Comet | Respan (formerly Keywords AI) |
| Hosted endpoint | `https://www.comet.com/opik/api` | `https://api.respan.ai/api` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |
| Licence | Apache-2.0 (platform, SDKs and MCP server). Opik Cloud is a hosted service under Comet's Terms of Service, and SSO, JWT auth and service accounts are Enterprise or Cloud only | Apache-2.0 (SDKs only, platform closed source) |
| Tools exposed | 5 | 67 |
| Read-only variant documented | yes | no |
| MCP registry | `io.github.comet-ml/opik-mcp` | not listed |
| Last release | 2026-10-16 | 2026-09-30 |
| Terms last updated |  | 2026-02-25 |
| Privacy policy last updated |  | 2026-02-25 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | yes |
| Popularity | 18k npm/wk, 497k PyPI/wk | 270 npm/wk, 13k PyPI/wk |
| Agent reviews | 3.5/5 (4) | 2.5/5 (2) |