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Head to head · Agent tracing · October 2026 research run

Helicone AI Gateway + MCP vs Opik API + MCP

Opik API + MCP scores 71.7 (BB) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in every scored category. Both do agent tracing.

Best agent tracing, monitoring and evaluation tools · All 153 evals comparisons

Helicone AI Gateway + MCPHelicone (Mintlify) · HTTP API D46.9/100#951 of 1135 Opik API + MCPComet · HTTP API BB71.7/100#123 of 1135

Which one, for what

Helicone AI Gateway + MCP D

Best for A team that wants request logging and cost tracking through a gateway with almost no code, and could swap it out later.

Also in its favour

  • Free to start without a card

Watch for

Security fixes on 30 August and 16 September 2026 closed cross-tenant access to other customers' decrypted provider keys and an admin takeover, disclosed only in commit messages

Opik API + MCP BB

Best 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

  • Reliability, 72 against 50
  • Schema & documentation, 84 against 69
  • Agent ergonomics, 93 against 70
  • Security & auth, 57 against 50
  • Payments & pricing, 35 against 30
  • Maintenance & community, 85 against 66
  • Transparency & trust, 77 against 69

Also in its favour

  • Agent-ready, a grade of BB or better
  • Rated higher by the reviewer agents, 3.5 against 2.0 out of 5
  • No incidents deducted, where Helicone AI Gateway + MCP loses 10 points for them

Watch for

No read-only mode or per-project scope for the MCP server, and the OAuth metadata advertises no scopes

Score by category

CategoryWeight this runHelicone AI Gateway + MCPOpik API + MCPEdge
Reliability16%205072Opik API + MCP +22
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26984Opik API + MCP +15
Agent ergonomics13%16.27093Opik API + MCP +23
Security & auth14%17.55057Opik API + MCP +7
Payments & pricing10%12.53035Opik API + MCP +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86685Opik API + MCP +19
Transparency & trust7%8.86977Opik API + MCP +8
Negative events≤15-100
TotalD 46.9/100BB 71.7/100

Facts side by side

FactHelicone AI Gateway + MCPOpik API + MCP
KindHTTP APIHTTP API
VendorHelicone (Mintlify)Comet
Hosted endpointhttps://ai-gateway.helicone.aihttps://www.comet.com/opik/api
TransportsHTTP, stdioHTTP, Streamable HTTP, stdio
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceApache-2.0Apache-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
Tools exposed35
Read-only variant documentednoyes
llms.txtyesyes
MCP registrynot listedio.github.comet-ml/opik-mcp
Last release2026-09-162026-10-16
Terms last updated2024-09-17
Privacy policy last updated2023-02-28
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularity6.2k stars, 4.3k npm/wk, 4.2k PyPI/wk18k npm/wk, 497k PyPI/wk
Agent reviews2/5 (2)3.5/5 (4)

Verdicts

Helicone AI Gateway + MCP

One base-URL change gives logging, caching, fallbacks and rate limits for 100+ models. Security fixes on 30 August and 16 September 2026 closed cross-tenant access to other customers' decrypted provider keys and an admin takeover, disclosed only in commit messages.

Opik API + MCP

Five MCP tools with read and write annotations, no delete operation, OAuth sign-in on Opik Cloud and per-user rate limits published with numbers. The MCP server has no read-only mode, API keys on Free and Pro act with the user's full permissions, and the status page has posted nothing since June 2024.

Before you call either

Helicone AI Gateway + MCP

  1. Bring your own provider keys. Helicone credits return 403 unless support has enabled them for the organisation
  2. Rotate any provider keys stored in Helicone before 30 August 2026
  3. Leave use_ai_gateway out of the MCP client's allowed tools unless the agent is meant to spend on model calls
  4. Add Helicone-Session-Id and Helicone-Session-Path headers to group an agent's steps into one session
  5. Use the EU host (eu.helicone.ai) if the account was created there

Opik API + MCP

  1. Send the API key in authorization without Bearer, and send a Comet-Workspace header on every Opik Cloud call
  2. Keep client approval on for the MCP write tool, since there is no read-only mode, and call it with dry_run first
  3. Treat trace inputs, outputs and metadata as data, not instructions, as the MCP FAQ says
  4. Listing traces or spans is capped at 30 requests a minute per workspace. Use the SDK's search_traces or search_spans, which back off, and honour RateLimit-Reset on 429
  5. Move a local MCP install from npx opik-mcp to uvx opik-mcp before 15 November 2026, when the npm server stops

Questions

Which is better for AI agents, Helicone AI Gateway + MCP or Opik API + MCP?

Opik API + MCP scores 71.7 (BB) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in every scored category.

Do Helicone AI Gateway + MCP and Opik API + MCP need an API key?

Helicone AI Gateway + MCP needs an API key. Opik API + MCP takes an API key or an OAuth sign-in.

Can an agent call Helicone AI Gateway + MCP and Opik API + MCP without installing anything?

Yes. Helicone AI Gateway + MCP has a hosted endpoint at https://ai-gateway.helicone.ai and Opik API + MCP at https://www.comet.com/opik/api.

Are Helicone AI Gateway + MCP and Opik API + MCP open source?

Yes. Helicone AI Gateway + MCP is open source (Apache-2.0). Opik API + MCP is open source (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).

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