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Official cutoffs · 12 monitored platforms

AI model shutdown and API deprecation deadlines

A date-ordered calendar of breaking AI platform changes. Every deadline links to the exact affected identifiers, observable symptoms, replacement, and official provider source.

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Verified September 11, 2026

Upcoming deadlines

Ordered by the platform's announced shutdown or effective date. Verify again before making a production cutover.

17 days left

Four legacy OpenAI models shut down on September 28, 2026

Choose gpt-5.4-mini or gpt-5-mini based on workload requirements, then migrate and test the integration.

OpenAI · OpenAI API19 days left

labs-leanstral-1-5: model retirement on September 30, 2026

No replacement identifier passed the evidence gate. Follow the linked provider documentation for the required request or behavior change.

Mistral · Mistral API40 days left

o1: model retirement on October 21, 2026

The official source lists gpt-5.6-sol as a replacement identifier. Test the migration against current provider documentation before production.

Microsoft · Azure AI Foundry76 days left

Vertex AI Extensions: api sunset on November 26, 2026

The official source lists Agent Platform as a replacement identifier. Test the migration against current provider documentation before production.

Google · Vertex AI

Breaking behavior

Already in effect

These changes can affect current requests now, even when a provider has not announced a future shutdown date.

AnthropicClaude APIhigh

claude-opus-4-1-20250805: model retirement on August 5, 2026

Anthropic documents a model retirement affecting claude-opus-4-1-20250805 on August 5, 2026. The source lists claude-opus-4-8 as a replacement identifier.

model retirementSearch repositories and deployment configuration for claude-opus-4-1-20250805. The official source lists claude-opus-4-8 as a replacement identifier. Test the migration against current provider documentation before production.
AnthropicClaude APIhigh

Claude Opus 4.7 and later reject non-default sampling parameters

Anthropic has deprecated temperature, top_p, and top_k on Claude Opus 4.7 and later; non-default values return an HTTP 400 error.

breaking behaviorStop sending temperature, top_p, and top_k for affected models. Express tone, variability, and formatting requirements in the system prompt instead.
AnthropicClaude APIhigh

Claude Sonnet 5 changes thinking defaults and token counts

Claude Sonnet 5 enables adaptive thinking by default, removes manual thinking budgets, rejects non-default sampling parameters, and tokenizes the same text into roughly 30% more tokens.

breaking behaviorRemove manual thinking budgets and non-default sampling parameters, rely on adaptive thinking, and use Anthropic's token-counting API to recalibrate limits and cost controls.
GoogleGemini APIhigh

Gemini deprecates temperature, top_p, and top_k

Gemini 3.6 Flash and 3.5 Flash-Lite ignore the sampling parameters; Google says future model generations will return HTTP 400 when they are supplied.

parameter deprecationStrip temperature, top_p, and top_k from Gemini requests and encode response constraints in a clear system instruction.
MicrosoftAzure AI Foundryhigh

gpt-5-chat: model retirement on June 29, 2026

Microsoft documents a model retirement affecting gpt-5-chat on June 29, 2026. The source lists gpt-chat-latest as a replacement identifier.

model retirementSearch repositories and deployment configuration for gpt-5-chat. The official source lists gpt-chat-latest as a replacement identifier. Test the migration against current provider documentation before production.
AnthropicClaude APIhigh

/v1/experimental/generate_prompt, /v1/experimental/improve_prompt, and 1 more: api sunset on August 17, 2026

Anthropic documents a api sunset affecting /v1/experimental/generate_prompt, /v1/experimental/improve_prompt, and 1 more on August 17, 2026. No replacement identifier passed the evidence gate.

api sunsetSearch repositories and deployment configuration for /v1/experimental/generate_prompt, /v1/experimental/improve_prompt, and /v1/experimental/templatize_prompt. No replacement identifier passed the evidence gate. Follow the linked provider documentation for the required request or behavior change.
MicrosoftAzure AI Foundryhigh

TimeGEN-1: model retirement on August 31, 2026

Microsoft documents a model retirement affecting TimeGEN-1 on August 31, 2026. The source lists TimeGPT-1 and TimegGPT-2.1 as replacement identifiers.

model retirementSearch repositories and deployment configuration for TimeGEN-1. The official source lists TimeGPT-1 and TimegGPT-2.1 as replacement identifiers. Test the migration against current provider documentation before production.

How to use this deadline calendar

Search your repositories and deployment configuration for every affected model ID, endpoint, SDK symbol, and request parameter. Migrate in staging before the listed date, then regression-test response shape, tool use, token consumption, latency, and cost.

Dates are recorded as calendar dates exactly as providers publish them. When a provider does not state a stable time and timezone, plan to finish the migration before that date begins.