2026 evidence ledger · through Aug 11, 2026
The state of AI API releases and retirements
This report counts only confirmed model releases with source-linked API IDs and retirements with dated announcements, cutoffs, replacements, and platform scope. It is a bounded view of the public record, not an estimate of every provider change.
- Published changes
- 23
- Model releases
- 16
- Dated retirements
- 7
- Providers represented
- 4
Recorded activity
Four providers account for the supported 2026 ledger
Release coverage is broader than retirement coverage. The retirement rows come from Anthropic because it is the only reviewed provider whose dated history currently passes the complete lifecycle contract.
5 releases · 7 retirements
6 releases · 0 retirements
3 releases · 0 retirements
2 releases · 0 retirements
Retirement notice
A 62-day median notice period
Across the 7 qualifying 2026 retirements, notice ranged from 60 to 189 days. These are calendar days between the source’s announcement and effective retirement date.
| Model ID | Announced | Retired | Notice | Source |
|---|---|---|---|---|
| claude-opus-4-1-20250805 | 2026-06-05 | 2026-08-05 | 61 days | Open |
| claude-opus-4-20250514 | 2026-04-14 | 2026-06-15 | 62 days | Open |
| claude-sonnet-4-20250514 | 2026-04-14 | 2026-06-15 | 62 days | Open |
| claude-3-haiku-20240307 | 2026-02-19 | 2026-04-20 | 60 days | Open |
| claude-3-5-haiku-20241022 | 2025-12-19 | 2026-02-19 | 62 days | Open |
| claude-3-7-sonnet-20250219 | 2025-10-28 | 2026-02-19 | 114 days | Open |
| claude-3-opus-20240229 | 2025-06-30 | 2026-01-05 | 189 days | Open |
Method and limits
The report is generated from the same repository contracts behind the public model-ID directory, API changelog, and lifecycle pages. Pricing and breaking-change counts are excluded until those event types have equivalent public evidence contracts. Detection-to-announcement lead time is also excluded because the public repository does not store a complete paired timestamp series for this sample.
Latest included event: Aug 5, 2026. Report cutoff: Aug 11, 2026.