Aug 5, 2026
Model retirement
Anthropic
claude-opus-4-1-20250805 retired
Recommended replacement: claude-opus-4-8.
Affected model IDs
claude-opus-4-1-20250805
Confirmed API changes
An AI API changelog with the affected model ID attached
This public ledger joins confirmed releases to documented API IDs and dated retirements to their recommended replacements. It publishes only change types the repository can support today; pricing and breaking-change rows will appear after their public contracts pass the same gate.
- Published changes
- 35
- Model releases
- 16
- Retirements
- 19
- Providers
- 4
Confirmed API changes
AI API changelog
35 shown
Evidence
Jul 31, 2026
Model release
DeepSeek
DeepSeek V4 Flash 0731
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
deepseek-v4-flash
Jul 24, 2026
Model release
Anthropic
Claude Opus 5
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
claude-opus-5
Jul 21, 2026
Model release
Gemini 3.6 Flash, Gemini 3.5 Flash-Lite, and Gemini 3.5 Flash Cyber
2 source-linked API model IDs attached to this confirmed release.
Affected model IDs
gemini-3.6-flash, gemini-3.5-flash-lite
Jul 9, 2026
Model release
OpenAI
GPT-5.6
3 source-linked API model IDs attached to this confirmed release.
Affected model IDs
gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna
Jun 30, 2026
Model release
Anthropic
Claude Sonnet 5
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
claude-sonnet-5
Jun 15, 2026
Model retirement
Anthropic
claude-opus-4-20250514 retired
Recommended replacement: claude-opus-4-8.
Affected model IDs
claude-opus-4-20250514
Jun 15, 2026
Model retirement
Anthropic
claude-sonnet-4-20250514 retired
Recommended replacement: claude-sonnet-4-6.
Affected model IDs
claude-sonnet-4-20250514
Jun 9, 2026
Model release
Anthropic
Claude Fable 5 and Claude Mythos 5
2 source-linked API model IDs attached to this confirmed release.
Affected model IDs
claude-mythos-5, claude-fable-5
May 28, 2026
Model release
Anthropic
Claude Opus 4.8
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
claude-opus-4-8
Apr 24, 2026
Model release
DeepSeek
DeepSeek V4
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
deepseek-v4-pro
Apr 23, 2026
Model release
OpenAI
GPT-5.5 and GPT-5.5 Pro
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-5.5-pro
Apr 20, 2026
Model retirement
Anthropic
claude-3-haiku-20240307 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-3-haiku-20240307
Apr 16, 2026
Model release
Anthropic
Claude Opus 4.7
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
claude-opus-4-7
Apr 2, 2026
Model release
Gemma 4
2 source-linked API model IDs attached to this confirmed release.
Affected model IDs
gemma-4-31b-it, gemma-4-26b-a4b-it
Mar 17, 2026
Model release
OpenAI
GPT-5.4 mini and nano
2 source-linked API model IDs attached to this confirmed release.
Affected model IDs
gpt-5.4-mini, gpt-5.4-nano
Mar 5, 2026
Model release
OpenAI
GPT-5.4 and GPT-5.4 Pro
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-5.4-pro
Mar 3, 2026
Model release
OpenAI
GPT-5.3 Instant
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-5.3-chat-latest
Feb 19, 2026
Model retirement
Anthropic
claude-3-5-haiku-20241022 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-3-5-haiku-20241022
Feb 19, 2026
Model retirement
Anthropic
claude-3-7-sonnet-20250219 retired
Recommended replacement: claude-sonnet-4-6.
Affected model IDs
claude-3-7-sonnet-20250219
Feb 19, 2026
Model release
Gemini 3.1 Pro
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gemini-3.1-pro-preview
Feb 5, 2026
Model release
OpenAI
GPT-5.3-Codex
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-5.3-codex
Jan 5, 2026
Model retirement
Anthropic
claude-3-opus-20240229 retired
Recommended replacement: claude-opus-4-8.
Affected model IDs
claude-3-opus-20240229
Oct 28, 2025
Model retirement
Anthropic
claude-3-5-sonnet-20240620 retired
Recommended replacement: claude-sonnet-4-6.
Affected model IDs
claude-3-5-sonnet-20240620
Oct 28, 2025
Model retirement
Anthropic
claude-3-5-sonnet-20241022 retired
Recommended replacement: claude-sonnet-4-6.
Affected model IDs
claude-3-5-sonnet-20241022
Jul 21, 2025
Model retirement
Anthropic
claude-2.0 retired
Recommended replacement: claude-opus-4-8.
Affected model IDs
claude-2.0
Jul 21, 2025
Model retirement
Anthropic
claude-2.1 retired
Recommended replacement: claude-opus-4-8.
Affected model IDs
claude-2.1
Jul 21, 2025
Model retirement
Anthropic
claude-3-sonnet-20240229 retired
Recommended replacement: claude-sonnet-4-6.
Affected model IDs
claude-3-sonnet-20240229
Nov 6, 2024
Model retirement
Anthropic
claude-1.0 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-1.0
Nov 6, 2024
Model retirement
Anthropic
claude-1.1 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-1.1
Nov 6, 2024
Model retirement
Anthropic
claude-1.2 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-1.2
Nov 6, 2024
Model retirement
Anthropic
claude-1.3 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-1.3
Nov 6, 2024
Model retirement
Anthropic
claude-instant-1.0 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-instant-1.0
Nov 6, 2024
Model retirement
Anthropic
claude-instant-1.1 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-instant-1.1
Nov 6, 2024
Model retirement
Anthropic
claude-instant-1.2 retired
Recommended replacement: claude-haiku-4-5-20251001.
Affected model IDs
claude-instant-1.2
The public changelog fails closed
A release needs a dated source and a documented API identifier. A retirement needs its cutoff, replacement, platform scope, and verification date. A provider page saying “deprecated” is not enough to create a change row.