Comet Introduces New Span Retention Tier at $29/100k Spans Amid Significant Pricing Changes
What happened
Between the Jan 1, 2025 and Apr 1, 2025 captures of Comet's pricing page, Pulse recorded 6 changes: LLM evaluation metric changed from 'traces' to 'spans' across all plans; New additional span retention pricing tier added at $29/100k spans; Additional spans pricing decreased from $8/100k to $5/100k; Pro plan data retention decreased from 360 days to 60 days; Free plan data retention decreased from 120 days to 60 days; Free plan monthly span allowance increased from 10k to 25k. Pulse files it as a pricing change (metric change, limit lowered, price decrease, limit raised) with a downward direction. Pulse's latest capture (Nov 9, 2026) lists Opik Pro Cloud at $19, MLOps Pro at $19, Additional Spans at $5 per 100k spans, Additional Span Retention at $29 per 100k spans retention and Additional Training Hours at $1 per training hour.
Comet's previous recorded change was "Comet Transitions to Flat-Rate Pricing Model, Introducing Trace-Based Metrics and Unlimited Team Members for Pro and Free Plans" (Q4 2024). Comet has been tracked since 2023-11-14.
In the same window Stripe, Squarespace and Adyen also changed their AI & Machine Learning pricing pages. Those moves are listed further down, and the Pulse Agent can compare them side by side.
- RewordedAll plansPricing modeltracesspans
- AddedAdditional Span RetentionLimit
BeforeNot listed
Afteradditional span retention pricing tier ($29)
- −37%Additional SpansPrice$8/100k$5/100k
- −83%ProLimit360 days60 days
- −50%—Limit120 days60 days
- +150%—Limit10k25k
| Plan | Field | Before | After | Change |
|---|---|---|---|---|
| All plans | Pricing model | traces | spans | Reworded |
| Additional Span Retention | Limit | Not listed | additional span retention pricing tier ($29) | Added |
| Additional Spans | Price | $8/100k | $5/100k | −37% |
| Pro | Limit | 360 days | 60 days | −83% |
| — | Limit | 120 days | 60 days | −50% |
| — | Limit | 10k | 25k | +150% |
Values as written on Comet's public pricing page in the two captures Pulse compared; where the page states no number, the cells give the wording before and after.
Evidence
The two captures Pulse comparedFull-page captures of Comet's pricing page (comet.com) from Jan 1, 2025 and Apr 1, 2025; the change is marked on the page, where additional spans price reads $8/100k and then $5/100k.
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Comet, the last 90 days
Full history- Apr 9, 2026PackagingComet caps free Cloud plan at 10 members, Pro at 50
- Jan 14, 2026Price decreaseComet Pro Cloud Plan Price Slashed by 51% to $19/month, New Open Source Tier Introduced
- Q2 2025ImprovementComet Enhances Enterprise Plan with SOC 2, ISO 27001, ISO 9001, HIPAA, and GDPR Compliance Certifications
- Q1 2025Price decreaseComet Introduces New Span Retention Tier at $29/100k Spans Amid Significant Pricing Changes This change
- Q4 2024PackagingComet Transitions to Flat-Rate Pricing Model, Introducing Trace-Based Metrics and Unlimited Team Members for Pro and Free Plans
Across AI & Machine Learning in the same window
All AI & Machine Learning changesQuestions about this change
Did Comet raise prices in April 2025?
No — prices went down. Between Jan 1, 2025 and Apr 1, 2025 Comet's pricing page showed 1 price cut: Additional Spans: $8/100k → $5/100k (−37%).
What changed on Comet's pricing page between Jan 1, 2025 and Apr 1, 2025?
All plans pricing model: traces → spans, reworded; Additional Span Retention limit added: additional span retention pricing tier ($29); Additional Spans price: $8/100k → $5/100k (−37%); Pro limit: 360 days → 60 days (−83%); limit: 120 days → 60 days (−50%); limit: 10k → 25k (+150%). Pulse compared the captures it took on Jan 1, 2025 and Apr 1, 2025; the before/after table above lists each item as written on the page.
How often does Comet change its pricing?
Pulse recorded 1 other pricing-page change for Comet in the 90 days before this one; the previous change was "Comet Transitions to Flat-Rate Pricing Model, Introducing Trace-Based Metrics and Unlimited Team Members for Pro and Free Plans" in Q4 2024; Comet has been tracked since 2023-11-14.