Lifecycle reference: distinguish deprecation from shutdown

AI Model Deprecation Tracker

Track every deprecated AI model across providers. See replacements, compare costs, and migrate before shutdown.

11
Selected Text/API Records
5
Providers Affected
100%
Have Replacements
↑47%
Avg. Cost Increase

Lifecycle deadlines, checked November 2

IdentifierStatus nowShutdownReplacement
gemini-omni-flash-preview; veo-3.1-generate-preview; veo-3.1-fast-generate-preview; veo-3.1-lite-generate-previewShutdown date passed Oct 22; Google lists shutdown dates as earliest possible, completion not tested2026-10-22gemini-omni-1.1-flash
gpt-4.1-nano-2025-04-14; o3-mini-2025-01-31; o4-mini-2025-04-16 (with legacy gpt-4-turbo, o1, o1-pro, gpt-4o-2024-05-13 and other old snapshots)Shut down — OpenAI's deprecations page lists the batch under Past deprecations ("was shut down on October 23, 2026") and the pricing page no longer lists any of the three (rechecked Nov 6, 2026; they were still listed through Nov 2), endpoint not tested2026-10-23gpt-5.6-luna; gpt-5.6-sol; gpt-5.6-terra
gemini-3.1-flash-tts-preview; gemini-3.1-flash-live-preview; gemini-2.5-flash-native-audio-preview-12-2025; gemini-2.5-flash-preview-tts; gemini-2.5-pro-preview-ttsScheduled; Google lists shutdown dates as earliest possible dates (deprecations page read Nov 2, 2026)2026-11-17gemini-3.8-flash-tts / gemini-3.8-flash-lite-tts; gemini-3.8-live
claude-sonnet-4-5-20250929Deprecated (announced September 30, 2026)2026-11-30claude-sonnet-5-5
kimi-k2.6; kimi-k2.7-code (Moonshot K2 series)Active but deprecated; closed to newly registered users from Oct 31, 2026 (existing users unaffected), retirement planned — plan, not a firm dated notice2026-12-31 (planned, by end of Dec 2026)kimi-k3.1-pro (moonshotai/kimi-k3.1-pro)
o3-2025-04-16; o3-pro-2025-06-10; gpt-5; gpt-5-mini; gpt-5-nano; gpt-5-pro-2025-10-06Scheduled; still serving until shutdown2026-12-11gpt-5.6-sol; gpt-5.6-terra; gpt-5.6-luna
gpt-4o-2024-08-06; gpt-4o-2024-11-20; gpt-4o-mini-2024-07-18; gpt-4.1-2025-04-14; gpt-4.1-mini-2025-04-14Active but deprecated; affected fine-tunes follow their base2027-01-14gpt-6-luna; evaluate behavior before migration
gpt-5.1; gpt-5.3-codexDeprecated, still callable2027-04-01gpt-6-sol
gpt-5.4-nanoDeprecated, still callable2027-04-01gpt-6-luna
tts-1; tts-1-hd; gpt-4o-mini-tts-2025-03-20; gpt-4o-mini-tts-2025-12-15Deprecated, still callable2027-01-06gpt-realtime-2.1-mini
gemini-2.5-flash-imageUncertain: official sources conflictPricing page: 2026-10-02; lifecycle page: 2027-03-15gemini-3.1-flash-lite-image; endpoint availability not tested
gemini-3.7-flashDeprecated; requests route to replacementNo shutdown date announcedgemini-3.8-flash
gemini-3.5-flashDeprecated; requests route to replacementNo shutdown date announcedgemini-3.6-flash
deep-research-pro-preview-12-2025Shutdown date passed Oct 23; Google's deprecations page (last updated Oct 22) still lists the row with its earliest-possible-dates caveat when rechecked Oct 28, completion not tested2026-10-23deep-research-preview-04-2026 or deep-research-max-preview-04-2026
antigravity-preview-05-2026Discontinued2026-10-05antigravity-preview-09-2026

Sources: OpenAI, Anthropic, Google and Moonshot. TTS and managed-agent migration can change interfaces and billing units, not only model names. Recheck the October 22–23, November 17 and December 11, 2026 rows on the next run once those dates pass, plus the Kimi K2 planned retirement at end of December 2026, and the OpenAI records on January 6 and April 1, 2027; these are scheduled dates, not early discontinuations.

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📅 Deprecation Timeline

May 2026
DeepSeek V3 deprecated
Replaced by DeepSeek V4 Flash — 48% cheaper, 2× faster
May 2026
Gemini 2.0 Flash & Flash Lite deprecated
Replaced by Gemini 3 Flash and 3.1 Flash-Lite — better quality at similar prices
June 15, 2026
Claude 4 Opus & Sonnet retired
Replaced by Claude Opus 4.8 and Sonnet 4.6 — 67% cheaper, improved reasoning
June 2026
Jamba 1.5 Large deprecated
Replaced by Jamba 1.7 Large — same price, better performance
October 22–23, 2026
Google preview and OpenAI legacy-snapshot shutdowns
gemini-omni-flash-preview and the Veo 3.1 previews ended Oct 22; o3-mini, o4-mini, gpt-4.1-nano and other legacy OpenAI snapshots were shut down Oct 23 (OpenAI confirms it on its deprecations page; with the Deep Research Pro agent, whose shutdown Google still lists as earliest-possible).
November 17, 2026
Google TTS & Live previews shut down
gemini-3.1-flash-tts-preview, gemini-3.1-flash-live-preview, the 2.5 native-audio/TTS previews — migrate to Gemini 3.8 TTS and 3.8 Live; Google lists shutdown dates as earliest possible
November 30, 2026
Claude Sonnet 4.5 retires
Deprecated September 30, 2026 on Anthropic-operated platforms — replaced by Claude Sonnet 5.5 at $2/$10
December 11, 2026
GPT-5 family and o3 retire
gpt-5, gpt-5-mini, gpt-5-nano, gpt-5-pro, o3 and o3-pro are removed from the API — replaced by GPT-5.6 Sol, Terra and Luna
January 6 / April 1, 2027
Scheduled OpenAI shutdowns
Older TTS identifiers end January 6; GPT-5.1, GPT-5.3-Codex and GPT-5.4-Nano end April 1. Deprecation is not immediate removal.
August 17, 2026
Imagen 4 (Standard, Ultra, Fast) shutdown
Replaced by Gemini 3.1 Flash Image ("Nano Banana") — new architecture, different pricing
August 26, 2026
OpenAI Assistants API (v2) shutdown
Replaced by Responses API — stateless architecture, developers manage their own state
🚨 Migration urgency

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Frequently Asked Questions

Which AI models are deprecated in 2026? +
OpenAI deprecated GPT-5.1, GPT-5.3-Codex and GPT-5.4-Nano on October 1, 2026; shutdown is scheduled for April 1, 2027. The October 23, 2026 batch — o3-mini, o4-mini, gpt-4.1-nano and other legacy snapshots — was shut down per OpenAI's deprecations page, with the pricing page dropping all three by the November 6, 2026 recheck (they were still listed there through November 2), and the GPT-5 family plus o3/o3-pro follow on December 11, 2026. Anthropic deprecated Claude Sonnet 4.5 on September 30, 2026 (retirement November 30, 2026), and Moonshot closed its K2 series to new users on October 31, 2026 with retirement planned by end of December 2026. Deprecated models remain callable until shutdown — see the current deadline table and provider notices rather than assuming every deprecated model has already stopped serving.
What happens when an AI model is deprecated? +
Deprecated models stop receiving new features, may have reduced reliability, and eventually shut down completely. It's best to migrate to the replacement model before the shutdown date to avoid service interruptions.
How do I migrate from a deprecated AI model? +
Each deprecated model has a recommended replacement. Use APIpulse's free migration tools to compare costs, get copy-paste migration code, and switch in under 5 minutes. Most migrations only require changing the model name in your API calls.
📅 2026 Deprecation Timeline
Interactive timeline of every model deprecation, price change, and new launch in 2026.
See the full timeline →