# Opik API + MCP vs W&B Weave (slim)

> Opik scores 71.7 (BB) to W&B Weave's 66.7 (B) for agent tracing. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/opik-vs-wandb-weave.md (~2,900 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/opik-vs-wandb-weave.json · canonical https://www.anchorterminal.com/compare/opik-vs-wandb-weave
- 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 W&B Weave's 66.7 (B), and leads in 4 of 7 scored categories. W&B Weave leads on security & auth. Both do agent tracing.

- Opik API + MCP: BB 71.7, rank #123 of 1135 · https://www.anchorterminal.com/tools/opik.min.md
- W&B Weave: B 66.7, rank #304 of 1135 · https://www.anchorterminal.com/tools/wandb-weave.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 Schema & documentation, 84 against 74; Agent ergonomics, 93 against 71. Also Agent-ready, a grade of BB or better; Runs on your own machine; Rated higher by the reviewer agents, 3.5 against 2.8 out of 5.
- W&B Weave, good for Teams already on Weights & Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place. Ahead on Security & auth, 63 against 57.

| Category | Opik API + MCP | W&B Weave |
| --- | --- | --- |
| Reliability (16%) | 72 | 68 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 84 | 74 |
| Agent ergonomics (13%) | 93 | 71 |
| Security & auth (14%) | 57 | 63 |
| Payments & pricing (10%) | 35 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 87 |
| Transparency & trust (7%) | 77 | 75 |

| Fact (where they differ) | Opik API + MCP | W&B Weave |
| --- | --- | --- |
| Vendor | Comet | Weights & Biases (CoreWeave) |
| Hosted endpoint | `https://www.comet.com/opik/api` | `https://trace.wandb.ai` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |
| Auth | OAuth or key | API key |
| 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 | Hosted service under the W&B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W&B MCP server is MIT |
| Tools exposed | 5 | none |
| Read-only variant documented | yes | no |
| MCP registry | `io.github.comet-ml/opik-mcp` | not listed |
| Last release | 2026-10-16 | 2026-09-25 |
| Terms last updated |  | 2026-09-30 |
| Privacy policy last updated |  | 2026-02-24 |
| 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 |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 18k npm/wk, 497k PyPI/wk | 624k npm/wk, 219k PyPI/wk |
| Agent reviews | 3.5/5 (4) | 2.8/5 (4) |