Which AI models are being shut down?
One page per model, answering the same three questions: is it deprecated, when does it shut down, and what replaces it. Every date is cited to the provider's own documentation, with the day we last checked it. 156 models tracked, current as of July 30, 2026.
Next shutdowns
Full calendar →The models that stop answering soonest. 45 shutdowns are still ahead.
-
Claude Opus 4.1Deprecated
claude-opus-4-1-20250805
August 5, 2026 · in 6 days
-
GPT-5.2 chat-latestDeprecated
gpt-5.2-chat-latest
August 10, 2026 · in 11 days
-
GPT-5.3 chat-latestDeprecated
gpt-5.3-chat-latest
August 10, 2026 · in 11 days
-
babbage-002Deprecated
babbage-002
September 28, 2026 · in 60 days
-
davinci-002Deprecated
davinci-002
September 28, 2026 · in 60 days
-
GPT-3.5 Turbo (1106)Deprecated
gpt-3.5-turbo-1106
September 28, 2026 · in 60 days
By provider
Every model we track
| Model | Provider | Status | Shutdown | Replacement |
|---|---|---|---|---|
|
Claude 1.0
claude-1.0
|
Anthropic | Retired |
November 6, 2024
631 days ago
|
claude-haiku-4-5-20251001 |
|
Claude 1.1
claude-1.1
|
Anthropic | Retired |
November 6, 2024
631 days ago
|
claude-haiku-4-5-20251001 |
|
Claude 1.2
claude-1.2
|
Anthropic | Retired |
November 6, 2024
631 days ago
|
claude-haiku-4-5-20251001 |
|
Claude 1.3
claude-1.3
|
Anthropic | Retired |
November 6, 2024
631 days ago
|
claude-haiku-4-5-20251001 |
|
Claude 2
claude-2.0
|
Anthropic | Retired |
July 21, 2025
374 days ago
|
claude-opus-4-8 |
|
Claude 2.1
claude-2.1
|
Anthropic | Retired |
July 21, 2025
374 days ago
|
claude-opus-4-8 |
|
Claude Haiku 3.5
claude-3-5-haiku-20241022
|
Anthropic | Retired |
February 19, 2026
161 days ago
|
claude-haiku-4-5-20251001 |
|
Claude Sonnet 3.5
claude-3-5-sonnet-20240620
|
Anthropic | Retired |
October 28, 2025
275 days ago
|
claude-sonnet-4-6 |
|
Claude Sonnet 3.5 v2
claude-3-5-sonnet-20241022
|
Anthropic | Retired |
October 28, 2025
275 days ago
|
claude-sonnet-4-6 |
|
Claude Sonnet 3.7
claude-3-7-sonnet-20250219
|
Anthropic | Retired |
February 19, 2026
161 days ago
|
claude-sonnet-4-6 |
|
Claude Haiku 3
claude-3-haiku-20240307
|
Anthropic | Retired |
April 20, 2026
101 days ago
|
claude-haiku-4-5-20251001 |
|
Claude Opus 3
claude-3-opus-20240229
|
Anthropic | Retired |
January 5, 2026
206 days ago
|
claude-opus-4-8 |
|
Claude Sonnet 3
claude-3-sonnet-20240229
|
Anthropic | Retired |
July 21, 2025
374 days ago
|
claude-sonnet-4-6 |
|
Claude Fable 5
claude-fable-5
|
Anthropic | Shutdown scheduled |
June 9, 2027 (earliest)
in 314 days
|
— |
|
Claude Haiku 4.5
claude-haiku-4-5-20251001
|
Anthropic | Shutdown scheduled |
October 15, 2026 (earliest)
in 77 days
|
— |
|
Claude Instant 1.0
claude-instant-1.0
|
Anthropic | Retired |
November 6, 2024
631 days ago
|
claude-haiku-4-5-20251001 |
|
Claude Instant 1.1
claude-instant-1.1
|
Anthropic | Retired |
November 6, 2024
631 days ago
|
claude-haiku-4-5-20251001 |
|
Claude Instant 1.2
claude-instant-1.2
|
Anthropic | Retired |
November 6, 2024
631 days ago
|
claude-haiku-4-5-20251001 |
|
Claude Opus 4.1
claude-opus-4-1-20250805
|
Anthropic | Deprecated |
August 5, 2026
in 6 days
|
claude-opus-4-8 |
|
Claude Opus 4
claude-opus-4-20250514
|
Anthropic | Retired |
June 15, 2026
45 days ago
|
claude-opus-4-8 |
|
Claude Opus 4.5
claude-opus-4-5-20251101
|
Anthropic | Shutdown scheduled |
November 24, 2026 (earliest)
in 117 days
|
— |
|
Claude Opus 4.6
claude-opus-4-6
|
Anthropic | Shutdown scheduled |
February 5, 2027 (earliest)
in 190 days
|
— |
|
Claude Opus 4.7
claude-opus-4-7
|
Anthropic | Shutdown scheduled |
April 16, 2027 (earliest)
in 260 days
|
— |
|
Claude Opus 4.8
claude-opus-4-8
|
Anthropic | Shutdown scheduled |
May 28, 2027 (earliest)
in 302 days
|
— |
|
Claude Opus 5
claude-opus-5
|
Anthropic | Shutdown scheduled |
July 24, 2027 (earliest)
in 359 days
|
— |
|
Claude Sonnet 4
claude-sonnet-4-20250514
|
Anthropic | Retired |
June 15, 2026
45 days ago
|
claude-sonnet-4-6 |
|
Claude Sonnet 4.5
claude-sonnet-4-5-20250929
|
Anthropic | Shutdown scheduled |
September 29, 2026 (earliest)
in 61 days
|
— |
|
Claude Sonnet 4.6
claude-sonnet-4-6
|
Anthropic | Shutdown scheduled |
February 17, 2027 (earliest)
in 202 days
|
— |
|
Claude Sonnet 5
claude-sonnet-5
|
Anthropic | Shutdown scheduled |
June 30, 2027 (earliest)
in 335 days
|
— |
|
Gemini 1.0 Flash
gemini-1.0-flash
|
Retired | — | gemini-2.5-flash | |
|
Gemini 1.0 Pro
gemini-1.0-pro
|
Retired | — | gemini-2.5-pro | |
|
Gemini 1.5 Flash
gemini-1.5-flash
|
Retired |
June 17, 2026
43 days ago
|
gemini-2.5-flash | |
|
Gemini 1.5 Pro
gemini-1.5-pro
|
Retired |
June 17, 2026
43 days ago
|
gemini-2.5-pro | |
|
Gemini 2.0 Flash
gemini-2.0-flash
|
Retired |
June 1, 2026
59 days ago
|
gemini-3.6-flash | |
|
Gemini 2.0 Flash-Lite
gemini-2.0-flash-lite
|
Retired |
June 1, 2026
59 days ago
|
gemini-3.1-flash-lite | |
|
Gemini 2.0 Flash-Lite (preview)
gemini-2.0-flash-lite-preview
|
Retired |
December 9, 2025
233 days ago
|
gemini-2.5-flash-lite | |
|
Gemini 2.5 Flash
gemini-2.5-flash
|
Shutdown scheduled |
October 16, 2026 (earliest)
in 78 days
|
gemini-3.6-flash | |
|
Gemini 2.5 Flash-Lite
gemini-2.5-flash-lite
|
Shutdown scheduled |
October 16, 2026 (earliest)
in 78 days
|
gemini-3.1-flash-lite | |
|
Gemini 2.5 Flash-Lite (preview 09-2025)
gemini-2.5-flash-lite-preview-09-2025
|
Retired |
March 31, 2026
121 days ago
|
gemini-3.1-flash-lite | |
|
Gemini 2.5 Flash (preview 05-20)
gemini-2.5-flash-preview-05-20
|
Retired |
November 18, 2025
254 days ago
|
gemini-3.6-flash | |
|
Gemini 2.5 Flash (preview 09-25)
gemini-2.5-flash-preview-09-25
|
Retired |
February 17, 2026
163 days ago
|
gemini-3.6-flash | |
|
Gemini 2.5 Pro
gemini-2.5-pro
|
Shutdown scheduled |
October 16, 2026 (earliest)
in 78 days
|
gemini-3.1-pro-preview | |
|
Gemini 2.5 Pro (preview 03-25)
gemini-2.5-pro-preview-03-25
|
Retired |
December 2, 2025
240 days ago
|
gemini-3.1-pro-preview | |
|
Gemini 2.5 Pro (preview 05-06)
gemini-2.5-pro-preview-05-06
|
Retired |
December 2, 2025
240 days ago
|
gemini-3.1-pro-preview | |
|
Gemini 2.5 Pro (preview 06-05)
gemini-2.5-pro-preview-06-05
|
Retired |
December 2, 2025
240 days ago
|
gemini-3.1-pro-preview | |
|
Gemini 3 Flash (preview)
gemini-3-flash-preview
|
Active | — | gemini-3.6-flash | |
|
Gemini 3 Pro (preview)
gemini-3-pro-preview
|
Retired |
March 9, 2026
143 days ago
|
gemini-3.1-pro-preview | |
|
Gemini 3.1 Flash-Lite
gemini-3.1-flash-lite
|
Shutdown scheduled |
May 7, 2027 (earliest)
in 281 days
|
gemini-3.5-flash-lite | |
|
Gemini 3.1 Flash-Lite (preview)
gemini-3.1-flash-lite-preview
|
Retired |
May 25, 2026
66 days ago
|
gemini-3.1-flash-lite | |
|
Gemini 3.1 Pro (preview)
gemini-3.1-pro-preview
|
Active | — | — | |
|
Gemini 3.5 Flash
gemini-3.5-flash
|
Active | — | — | |
|
Gemini 3.5 Flash-Lite
gemini-3.5-flash-lite
|
Active | — | — | |
|
Gemini 3.6 Flash
gemini-3.6-flash
|
Active | — | — | |
|
ada
ada
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
babbage-002 |
|
babbage
babbage
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
babbage-002 |
|
babbage-002
babbage-002
|
OpenAI | Deprecated |
September 28, 2026
in 60 days
|
gpt-5.4-mini |
|
ChatGPT-4o latest
chatgpt-4o-latest
|
OpenAI | Retired |
February 17, 2026
163 days ago
|
gpt-5.1-chat-latest |
|
ChatGPT Image latest
chatgpt-image-latest
|
OpenAI | Deprecated |
December 1, 2026
in 124 days
|
gpt-image-2 |
|
code-davinci-002
code-davinci-002
|
OpenAI | Retired |
March 23, 2023
1225 days ago
|
gpt-4o |
|
codex-mini-latest
codex-mini-latest
|
OpenAI | Retired |
February 12, 2026
168 days ago
|
gpt-5-codex-mini |
|
computer-use-preview
computer-use-preview
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-terra |
|
curie
curie
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
davinci-002 |
|
DALL·E 2
dall-e-2
|
OpenAI | Retired |
May 12, 2026
79 days ago
|
gpt-image-2 |
|
DALL·E 3
dall-e-3
|
OpenAI | Retired |
May 12, 2026
79 days ago
|
gpt-image-2 |
|
davinci
davinci
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
davinci-002 |
|
davinci-002
davinci-002
|
OpenAI | Deprecated |
September 28, 2026
in 60 days
|
gpt-5.4-mini |
|
GPT-3.5 Turbo
gpt-3.5-turbo
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-terra |
|
GPT-3.5 Turbo (0301)
gpt-3.5-turbo-0301
|
OpenAI | Retired |
September 13, 2024
685 days ago
|
gpt-3.5-turbo |
|
GPT-3.5 Turbo (0613)
gpt-3.5-turbo-0613
|
OpenAI | Retired |
September 13, 2024
685 days ago
|
gpt-3.5-turbo |
|
GPT-3.5 Turbo (1106)
gpt-3.5-turbo-1106
|
OpenAI | Deprecated |
September 28, 2026
in 60 days
|
gpt-5.4-mini |
|
GPT-3.5 Turbo Instruct
gpt-3.5-turbo-instruct
|
OpenAI | Deprecated |
September 28, 2026
in 60 days
|
gpt-5.4-mini |
|
GPT-4
gpt-4
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-sol |
|
GPT-4 Turbo preview (0125)
gpt-4-0125-preview
|
OpenAI | Retired |
March 26, 2026
126 days ago
|
gpt-5.6-sol |
|
GPT-4 (0314)
gpt-4-0314
|
OpenAI | Retired |
March 26, 2026
126 days ago
|
gpt-4 |
|
GPT-4 Turbo preview (1106)
gpt-4-1106-preview
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-sol |
|
GPT-4 32k
gpt-4-32k
|
OpenAI | Retired |
June 6, 2025
419 days ago
|
gpt-4o |
|
GPT-4 Turbo
gpt-4-turbo
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-sol |
|
GPT-4 Turbo preview
gpt-4-turbo-preview
|
OpenAI | Retired |
March 26, 2026
126 days ago
|
gpt-5.6-sol |
|
GPT-4 Vision preview
gpt-4-vision-preview
|
OpenAI | Retired |
December 6, 2024
601 days ago
|
gpt-4o |
|
GPT-4.1
gpt-4.1
|
OpenAI | Active | — | — |
|
GPT-4.1 mini
gpt-4.1-mini
|
OpenAI | Active | — | — |
|
GPT-4.1 nano
gpt-4.1-nano
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-luna |
|
GPT-4.5 preview
gpt-4.5-preview
|
OpenAI | Retired |
July 14, 2025
381 days ago
|
gpt-4.1 |
|
GPT-4o
gpt-4o
|
OpenAI | Active | — | — |
|
GPT-4o (2024-05-13)
gpt-4o-2024-05-13
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-sol |
|
GPT-4o Audio preview
gpt-4o-audio-preview
|
OpenAI | Retired |
May 7, 2026
84 days ago
|
gpt-audio-1.5 |
|
GPT-4o Audio preview (2024-10-01)
gpt-4o-audio-preview-2024-10-01
|
OpenAI | Retired |
October 10, 2025
293 days ago
|
gpt-audio-1.5 |
|
GPT-4o mini
gpt-4o-mini
|
OpenAI | Active | — | — |
|
GPT-4o mini Audio preview
gpt-4o-mini-audio-preview
|
OpenAI | Retired |
May 7, 2026
84 days ago
|
gpt-audio-mini |
|
GPT-4o mini Realtime preview
gpt-4o-mini-realtime-preview
|
OpenAI | Retired |
May 7, 2026
84 days ago
|
gpt-realtime-mini |
|
GPT-4o mini search-preview
gpt-4o-mini-search-preview-2025-03-11
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-terra |
|
GPT-4o Realtime preview
gpt-4o-realtime-preview
|
OpenAI | Retired |
May 7, 2026
84 days ago
|
gpt-realtime-1.5 |
|
GPT-4o Realtime preview (2024-10-01)
gpt-4o-realtime-preview-2024-10-01
|
OpenAI | Retired |
October 10, 2025
293 days ago
|
gpt-realtime-1.5 |
|
GPT-4o search-preview
gpt-4o-search-preview-2025-03-11
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-terra |
|
GPT-5
gpt-5
|
OpenAI | Deprecated |
December 11, 2026
in 134 days
|
gpt-5.6-sol |
|
GPT-5 chat-latest
gpt-5-chat-latest
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-sol |
|
GPT-5 Codex
gpt-5-codex
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-sol |
|
GPT-5 Codex mini
gpt-5-codex-mini
|
OpenAI | Active | — | — |
|
GPT-5 mini
gpt-5-mini
|
OpenAI | Deprecated |
December 11, 2026
in 134 days
|
gpt-5.6-terra |
|
GPT-5 nano
gpt-5-nano
|
OpenAI | Deprecated |
December 11, 2026
in 134 days
|
gpt-5.6-luna |
|
GPT-5 Pro
gpt-5-pro
|
OpenAI | Deprecated |
December 11, 2026
in 134 days
|
gpt-5.6-sol |
|
GPT-5.1 chat-latest
gpt-5.1-chat-latest
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-sol |
|
GPT-5.1 Codex
gpt-5.1-codex
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.3-codex |
|
GPT-5.1 Codex Max
gpt-5.1-codex-max
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.3-codex |
|
GPT-5.1 Codex mini
gpt-5.1-codex-mini
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-terra |
|
GPT-5.2 chat-latest
gpt-5.2-chat-latest
|
OpenAI | Deprecated |
August 10, 2026
in 11 days
|
gpt-5.6-sol |
|
GPT-5.2 Codex
gpt-5.2-codex
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.3-codex |
|
GPT-5.3 chat-latest
gpt-5.3-chat-latest
|
OpenAI | Deprecated |
August 10, 2026
in 11 days
|
gpt-5.6-sol |
|
GPT-5.3 Codex
gpt-5.3-codex
|
OpenAI | Active | — | — |
|
GPT-5.3 Codex Spark
gpt-5.3-codex-spark
|
OpenAI | Active | — | — |
|
GPT-5.4
gpt-5.4
|
OpenAI | Active | — | — |
|
GPT-5.4 mini
gpt-5.4-mini
|
OpenAI | Active | — | — |
|
GPT-5.4 nano
gpt-5.4-nano
|
OpenAI | Active | — | — |
|
GPT-5.4 Pro
gpt-5.4-pro
|
OpenAI | Active | — | — |
|
GPT-5.5
gpt-5.5
|
OpenAI | Active | — | — |
|
GPT-5.5 Pro
gpt-5.5-pro
|
OpenAI | Active | — | — |
|
GPT-5.6 Luna
gpt-5.6-luna
|
OpenAI | Active | — | — |
|
GPT-5.6 Sol
gpt-5.6-sol
|
OpenAI | Active | — | — |
|
GPT-5.6 Terra
gpt-5.6-terra
|
OpenAI | Active | — | — |
|
GPT Audio
gpt-audio
|
OpenAI | Deprecated |
January 20, 2027
in 174 days
|
gpt-audio-1.5 |
|
GPT Audio 1.5
gpt-audio-1.5
|
OpenAI | Active | — | — |
|
GPT Audio mini
gpt-audio-mini
|
OpenAI | Deprecated |
January 20, 2027
in 174 days
|
gpt-audio-1.5 |
|
GPT Audio mini (2025-10-06)
gpt-audio-mini-2025-10-06
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-audio-1.5 |
|
GPT Image 1
gpt-image-1
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-image-2 |
|
GPT Image 1 mini
gpt-image-1-mini
|
OpenAI | Deprecated |
December 1, 2026
in 124 days
|
gpt-image-2 |
|
GPT Image 1.5
gpt-image-1.5
|
OpenAI | Deprecated |
December 1, 2026
in 124 days
|
gpt-image-2 |
|
GPT Image 2
gpt-image-2
|
OpenAI | Active | — | — |
|
gpt-oss-120b
gpt-oss-120b
|
OpenAI | Active | — | — |
|
gpt-oss-20b
gpt-oss-20b
|
OpenAI | Active | — | — |
|
GPT Realtime
gpt-realtime
|
OpenAI | Deprecated |
January 20, 2027
in 174 days
|
gpt-realtime-2.1 |
|
GPT Realtime 1.5
gpt-realtime-1.5
|
OpenAI | Active | — | — |
|
GPT Realtime 2.1
gpt-realtime-2.1
|
OpenAI | Active | — | — |
|
GPT Realtime 2.1 mini
gpt-realtime-2.1-mini
|
OpenAI | Active | — | — |
|
GPT Realtime mini
gpt-realtime-mini
|
OpenAI | Deprecated |
January 20, 2027
in 174 days
|
gpt-realtime-2.1-mini |
|
GPT Realtime mini (2025-10-06)
gpt-realtime-mini-2025-10-06
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-realtime-2.1-mini |
|
o1
o1
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-sol |
|
o1-mini
o1-mini
|
OpenAI | Retired |
October 27, 2025
276 days ago
|
o4-mini |
|
o1-preview
o1-preview
|
OpenAI | Retired |
July 28, 2025
367 days ago
|
o3 |
|
o1-pro
o1-pro
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-sol |
|
o3
o3
|
OpenAI | Deprecated |
December 11, 2026
in 134 days
|
gpt-5.6-sol |
|
o3-deep-research
o3-deep-research
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-sol |
|
o3-mini
o3-mini
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-sol |
|
o3-pro
o3-pro
|
OpenAI | Deprecated |
December 11, 2026
in 134 days
|
gpt-5.6-sol |
|
o4-mini
o4-mini
|
OpenAI | Deprecated |
October 23, 2026
in 85 days
|
gpt-5.6-terra |
|
o4-mini-deep-research
o4-mini-deep-research
|
OpenAI | Retired |
July 23, 2026
7 days ago
|
gpt-5.6-sol |
|
omni-moderation
omni-moderation
|
OpenAI | Active | — | — |
|
text-ada-001
text-ada-001
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
gpt-3.5-turbo-instruct |
|
text-babbage-001
text-babbage-001
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
gpt-3.5-turbo-instruct |
|
text-curie-001
text-curie-001
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
gpt-3.5-turbo-instruct |
|
text-davinci-001
text-davinci-001
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
gpt-3.5-turbo-instruct |
|
text-davinci-002
text-davinci-002
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
gpt-3.5-turbo-instruct |
|
text-davinci-003
text-davinci-003
|
OpenAI | Retired |
January 4, 2024
938 days ago
|
gpt-3.5-turbo-instruct |
|
text-embedding-3-large
text-embedding-3-large
|
OpenAI | Active | — | — |
|
text-embedding-3-small
text-embedding-3-small
|
OpenAI | Active | — | — |
|
text-embedding-ada-002
text-embedding-ada-002
|
OpenAI | Active | — | text-embedding-3-small |
|
text-moderation-007
text-moderation-007
|
OpenAI | Retired |
October 27, 2025
276 days ago
|
omni-moderation |
No model matches that filter.
Recently retired
Models that have already stopped answering. Calls to these return an error.
- computer-use-preview computer-use-preview shut down July 23, 2026
- GPT-4o mini search-preview gpt-4o-mini-search-preview-2025-03-11 shut down July 23, 2026
- GPT-4o search-preview gpt-4o-search-preview-2025-03-11 shut down July 23, 2026
- GPT-5 chat-latest gpt-5-chat-latest shut down July 23, 2026
- GPT-5 Codex gpt-5-codex shut down July 23, 2026
- GPT-5.1 chat-latest gpt-5.1-chat-latest shut down July 23, 2026
- GPT-5.1 Codex gpt-5.1-codex shut down July 23, 2026
- GPT-5.1 Codex Max gpt-5.1-codex-max shut down July 23, 2026