AI Radar

Gemini 1.5 Flash

Retired · Language, Multimodal

Gemini 1.5 Flash is a Google model that accepts text, images, audio and video and returns text, introduced at Google I/O 2024 in public preview in Google AI Studio and Vertex AI with a 1 million token context window. Google says it was distilled from 1.5 Pro to be fast and efficient to serve; from July 2024 it also ran the free Gemini app. [1] [2] [3]appendix 12.1 Model Card (Table 45) [4] Primary source

Timeline of Gemini 1.5 Flash →

Claims and evidence

  • Released Public preview in Google AI Studio and Vertex AI, announced at Google I/O.Other sources give: [5]May 10, 2024 The Gemini API release notes list the preview release of gemini-1.5-flash-latest under May 10, 2024, before the I/O announcement. Primary source[1]introduction [2]Availability
  • Retired Retirement date of gemini-1.5-flash-001 on Google Cloud (Agent Platform, formerly Vertex AI).Other sources give: [5]September 29, 2025 Shutdown of the gemini-1.5-flash model id on the Gemini API; from 2024-11-21 that id pointed to gemini-1.5-flash-002 (release notes, November 21, 2024). Primary source[6]Retired models: gemini-1.5-flash-001
  • Generally available (gemini-1.5-flash-001) Other sources give: [6]Retired models: gemini-1.5-flash-001 Release date of gemini-1.5-flash-001 on Google Cloud.; [7] Date of the developer post announcing the stable release and billing for 1.5 Flash and 1.5 Pro. Primary source[5]May 23, 2024
  • Model for the free version of the Gemini app Primary source[4] [8]2024.07.25
  • Status Retiredgemini-1.5-flash-001 is listed as retired on Google Cloud; the gemini-1.5-flash model id was shut down on the Gemini API on 2025-09-29. Primary source[6]Retired models: gemini-1.5-flash-001 [5]September 29, 2025
  • Replaced by Gemini 2.5 Flash-LiteRecommended upgrade for gemini-1.5-flash-001 as listed on the Agent Platform model versions page when checked on 2026-10-01. Primary source[6]Retired models: gemini-1.5-flash-001
  • Derived from (distillation) Gemini 1.5 Pro Primary source[1]The new 1.5 Flash, optimized for speed and efficiency [3]section 3.2 Gemini 1.5 Flash; appendix 12.1 Model Card (Table 45)
  • Change · Size A smaller, lighter-weight model than 1.5 Pro.Compared with Gemini 1.5 Pro Primary source[2] [1]
  • Change · Efficiency Designed for lower latency and lower cost to serve than 1.5 Pro, according to Google.Compared with Gemini 1.5 Pro Primary source[1]
  • Change · Architecture A dense Transformer decoder distilled online from 1.5 Pro, which is a sparse mixture-of-experts model.Compared with Gemini 1.5 Pro Primary source[3]section 3.2 Gemini 1.5 Flash
  • Input text, image, audio, video Primary source[2]Natively multimodal with long context [3]appendix 12.1 Model Card (Table 45), Input(s)
  • Output text Primary source[3]appendix 12.1 Model Card (Table 45), Output(s)
  • Feature Fine tuning availableText tuning in Google AI Studio and the Gemini API from August 2024; the release notes say tuning ended on 2025-05-27. Primary source[9]Gemini 1.5 Flash tuning rollout now complete [5]August 5, 2024
  • Context window 1 million tokensContext window in Google AI Studio and Vertex AI at launch. In the free Gemini app the window was 32K tokens (July 2024 post). Primary source[1]introduction [2]Natively multimodal with long context
  • Parameters Not disclosedNot disclosed by Google. No claim madeNo source
  • Access API, consumer appGemini API through Google AI Studio and Vertex AI; Gemini app from 2024-07-25. Primary source[1]introduction [4]

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