Opik review

Opik, from Comet, offers the lowest-cost path to full prompt versioning on a tracing platform. Its Prompt Library keeps prompts outside the codebase, versions each change automatically and links the exact version that ran to its trace. In code you fetch a prompt by name and choose what you get: the latest version, a pinned version such as v3, or whatever is deployed to an environment like production, which you change from the Opik UI rather than in code. Chat prompts with system, user and assistant roles are supported. Beyond versioning, Opik adds prompt and tool optimization with 8+ algorithms, test suites with assertions, 30+ built-in evaluation metrics and an MCP server and skills for coding assistants. The open source edition is free and shares one codebase with the cloud. Free Cloud covers up to 10 members and 25k spans a month, and Pro Cloud is $19 a month for up to 50 members. Enterprise controls such as SSO need a custom plan.

Who it is for

Budget-conscious teams that want open source prompt versioning, environments and prompt optimization in one tool.

Price

Open source free; Free Cloud for up to 10 members; Pro Cloud $19 per month.

Expanded usage for teams $19 Per month
Quoted from the vendor pricing page on November 7, 2026.

Key features

• Prompt Library that versions each change automatically
• Fetch a prompt by version or by environment such as production
• Text and chat prompts with template variables
• Prompt optimization with 8+ algorithms
• Test suites with assertions for regression testing

Strengths and weaknesses

• Strength: Pro Cloud costs $19 a month, the cheapest paid cloud plan among the tracing platforms here
• Strength: Open source edition uses the same codebase as the hosted versions
• Strength: 60-day data retention even on the free cloud plan
• Weakness: Pro Cloud caps teams at 50 members
• Weakness: SSO and flexible deployments are Enterprise only
• Weakness: The Ollie assistant needs purchased tokens after the trial

Key facts

• Free Cloud: Up to 10 members, 25k spans a month, 60-day retention
• Pro Cloud: $19 per month, up to 50 members, 100k spans
• Open source: Free to download and self-host
• Compliance: SOC 2, ISO 27001, HIPAA and GDPR on Enterprise

Where it ranks

Opik is No. 5 in our Best AI Prompt Management Tools verdict.