Sep 23, 2026
Model release
Gemini 3.8 Flash TTS and Flash-Lite TTS
2 source-linked API model IDs attached to this confirmed release.
Affected model IDs
gemini-3.8-flash-tts, gemini-3.8-flash-lite-tts
Confirmed API changes
An AI API changelog with the affected model ID attached
- Published changes
- 57
- Model releases
- 38
- Retirements
- 19
- Providers
- 10
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.
Confirmed API changes
AI API changelog
57 shown
Evidence
Sep 22, 2026
Model release
Anthropic
Claude Opus 5.5
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
claude-opus-5-5
Sep 22, 2026
Model release
OpenAI
GPT-6 Sol and GPT-6 Luna
2 source-linked API model IDs attached to this confirmed release.
Affected model IDs
gpt-6-sol, gpt-6-luna
Sep 21, 2026
Model release
xAI
Grok 4.7
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
grok-4.7
Sep 20, 2026
Model release
StepFun
Step 5 Preview
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
step-5-preview
Sep 15, 2026
Model release
Gemini 3.8 Live and Gemini 3.8 Live Extended Thinking
2 source-linked API model IDs attached to this confirmed release.
Affected model IDs
gemini-3.8-live, gemini-3.8-live-extended-thinking
Sep 10, 2026
Model release
DeepSeek
DeepSeek V4.1 Flash
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
deepseek-flash
Sep 10, 2026
Model release
OpenAI
GPT-Live-1 in the API
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-live-1
Sep 3, 2026
Model release
OpenAI
GPT-6 Astra
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-6-astra
Sep 2, 2026
Model release
Gemini 3.8 Flash and Gemini 3.8 Flash Cyber
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gemini-3.8-flash
Sep 2, 2026
Model release
Meta
Muse Spark 1.3
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
muse-spark-1.3
Sep 2, 2026
Model release
Multiverse Computing
Quasar 438B
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
quasar-438b
Sep 1, 2026
Model release
Anthropic
Claude Fable 5.1 and Claude Mythos 5.1
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
claude-fable-5-1
Aug 26, 2026
Model release
Gemini 3.5 Transcribe
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gemini-3.5-transcribe
Aug 13, 2026
Model release
DeepSeek
DeepSeek V4 Pro 0813
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
deepseek-v4-pro
Aug 13, 2026
Model release
Gemini 3.7 Flash
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gemini-3.7-flash
Aug 13, 2026
Model release
Mixedbread
Toast 1
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
toast-1
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
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 28, 2026
Model release
OpenAI
GPT Live Transcribe
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-live-transcribe
Jul 28, 2026
Model release
OpenAI
GPT Transcribe
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-transcribe
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 22, 2026
Model release
Celeris
Celeris-1
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
celeris-1
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
Jul 6, 2026
Model release
OpenAI
GPT Realtime 2.1
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-realtime-2.1
Jul 6, 2026
Model release
OpenAI
GPT Realtime 2.1 Mini
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-realtime-2.1-mini
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 23, 2026
Model release
OpenAI
GPT Audio 1.5
1 source-linked API model ID attached to this confirmed release.
Affected model IDs
gpt-audio-1.5
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.