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Model

Gemini 1.5 Flash

Gemini 1.5 Flash is a lightweight, fast model in Google's Gemini 1.5 family, announced on 14 May 2024 and trained by distillation from 1.5 Pro, with a 1-million-token context window.

Status DeprecatedModality Text, Image, Audio, VideoContext (K tokens) 1000 Era Generative AI for everyone

License
Proprietary
Access
API, App, Enterprise
Release date
Developer
Google DeepMind

What it is

Gemini 1.5 Flash is a lightweight model in Google's Gemini 1.5 family. Google announced it on 14 May 2024 at its I/O developer conference, in a post by Demis Hassabis, presenting it as the fastest Gemini model then served in the API.[1] An API, or application programming interface, is the channel through which other software calls a model, so “fastest in the API” describes how quickly developers get answers back, not only how a model scores on tests.

Where it came from

Inside the family it sat below Gemini 1.5 Pro: Google described it as lighter than 1.5 Pro and designed to be fast and efficient to serve at scale.[1] It was not trained from scratch. Google trained it with 1.5 Pro through a process it called distillation, transferring the most essential knowledge and skills from the larger model to the smaller one.[1] Distillation in general means letting a small model learn from the outputs and behaviour of a large one, so that it picks up much of the larger model's competence at a far lower computing cost.

What it offered

Like 1.5 Pro, 1.5 Flash was offered in public preview with a context window of 1 million tokens, in Google AI Studio and Vertex AI.[1] The context window is how much input a model can take into account at once; a very long one makes it possible to work over whole books, long transcripts or large tables within a single request.

Google named summarisation, chat applications, image and video captioning, and data extraction from long documents and tables as uses.[1] It said 1.5 Flash is optimised for high-volume, high-frequency tasks at scale and is more cost-efficient to serve.[1] It also said that although 1.5 Flash is lighter than 1.5 Pro, it is highly capable of multimodal reasoning — reasoning across more than one kind of input, such as text together with images.[1] For developers, that adds up to a choice inside one family: the larger model when capability matters most, the lighter one when very many requests have to be handled cheaply.

Place in the line

1.5 Flash was released to the API on 14 May 2024, and it was later succeeded by Gemini 2.0 Flash; the Gemini 1.5 models have since been discontinued.[2] The arrangement it illustrates — a cheaper, faster sibling beside a flagship, trained by distillation from it and aimed at high-frequency use — became a common way for model providers to serve many small requests rather than a few large ones.

[1]: Google, “Gemini breaks new ground with a faster model, longer context, AI agents and more” [2]: Wikipedia, “Gemini (language model)”

CapabilitiesLarge language modelsMultimodal

Ecosystem & regionDeveloper tools

Version history

21
  1. 2022
    • Apr 4, 2022 PaLM

      PaLM is a 540-billion-parameter dense Transformer language model announced by Google Research in April 2022, trained with the Pathways system across 6,144 TPU v4 chips; it set strong few-shot results on many benchmarks.

  2. 2023
    • May 10, 2023 PaLM 2

      PaLM 2 is Google's second-generation Pathways language model, announced on 10 May 2023 in four sizes and used across more than 25 Google products, including Bard.

    • Dec 6, 2023 Gemini 1.0 (Ultra, Pro, Nano)

      Gemini 1.0 is the first generation of Google DeepMind's multimodal model family, announced on 6 December 2023 in Ultra, Pro and Nano sizes; Google reported its Ultra version as the first model to beat human experts on MMLU.

  3. 2024
    • Feb 15, 2024 Gemini 1.5 Pro

      A mid-size multimodal model in Google's Gemini 1.5 generation, announced in February 2024, known for a context window that reached one million tokens and later two million.

    • May 14, 2024 Gemini 1.5 Flash · This page

      Gemini 1.5 Flash is a lightweight, fast model in Google's Gemini 1.5 family, announced on 14 May 2024 and trained by distillation from 1.5 Pro, with a 1-million-token context window.

    • Dec 11, 2024 Gemini 2.0 Flash

      Gemini 2.0 Flash is the first model of Google's Gemini 2.0 generation, released as an experimental model in December 2024 with multimodal output and native tool calling, and made generally available in February 2025.

  4. 2025
    • Feb 5, 2025 Gemini 2.0 Pro

      An experimental Google model released in February 2025 as part of the Gemini 2.0 family, described by Google as its best yet for coding and complex prompts, with a 2-million-token context window and tool use.

    • Mar 25, 2025 Gemini 2.5 Pro

      Gemini 2.5 Pro is Google's first model in the Gemini 2.5 family, released in March 2025 as a "thinking model" with a 1-million-token context window, debuting at number one on LMArena.

    • Apr 17, 2025 Gemini 2.5 Flash

      A model in Google's Gemini 2.5 family, released in preview in April 2025 and generally available that June. Google called it its first fully hybrid reasoning model, letting developers turn thinking on or off with a token budget.

    • Jun 17, 2025 Gemini 2.5 Flash-Lite

      Gemini 2.5 Flash-Lite is the lowest-cost model in Google's Gemini 2.5 family, built for high-throughput work such as classification and summarisation, with thinking off by default and a controllable thinking budget.

    • Nov 18, 2025 Gemini 3 Pro

      Gemini 3 Pro is the first model of Google's Gemini 3 generation, released in preview in November 2025 with a 1-million-token context window and top-ranked results on arena leaderboards and reasoning, coding and multimodal benchmarks.

    • Dec 17, 2025 Gemini 3 Flash

      Gemini 3 Flash is a fast, lower-cost model in Google's Gemini 3 family, released on 17 December 2025. It scored close to Gemini 3 Pro on several benchmarks while using fewer tokens and costing far less per token.

  5. 2026
    • Feb 19, 2026 Gemini 3.1 Pro

      Gemini 3.1 Pro is Google's preview upgrade to Gemini 3 Pro, released on 19 February 2026, scoring a verified 77.1% on ARC-AGI-2 and shipped through the Gemini API, the Gemini app and NotebookLM.

    • Mar 3, 2026 Gemini 3.1 Flash-Lite

      Gemini 3.1 Flash-Lite is a low-cost, low-latency multimodal model in Google's Gemini 3 family, released in preview in March 2026 and generally available from May 2026 for high-frequency, lightweight tasks.

    • May 19, 2026 Gemini 3.5 Flash

      Gemini 3.5 Flash is Google's first Gemini 3.5 model, announced on 19 May 2026 and built for agentic and coding work; it became the default model in the Gemini app and in AI Mode in Search.

    • Jul 21, 2026 Gemini 3.5 Flash-Lite

      The fastest model in Google's Gemini 3.5 series, released in July 2026 for high-throughput agentic work, and slated to replace gemini-3.1-flash-lite and take over traffic from gemini-2.5-flash.

    • Jul 21, 2026 Gemini 3.6 Flash

      Gemini 3.6 Flash is the Gemini model Google released on 21 July 2026 and called its workhorse: better coding, knowledge work and multimodal results than 3.5 Flash, fewer output tokens, built-in computer use and tiered pricing.

    • Aug 13, 2026 Gemini 3.7 Flash

      A Google model released on 13 August 2026 as its most intelligent workhorse for coding and agents, priced with a scheduled increase and superseded three weeks later by 3.8 Flash.

    • Sep 2, 2026 Gemini 3.8 Flash

      Gemini 3.8 Flash is Google's fast, low-cost model released on 2 September 2026, alongside a cybersecurity variant, Gemini 3.8 Flash Cyber, with introductory pricing that doubles at the start of 2027.

    • Oct 13, 2026 Gemini 4 Argon

      Gemini 4 Argon is the first model in Google's Gemini 4 family, announced on 30 September 2026 and made generally available on 13 October 2026, built for long multi-step work and shipped with a one-million-token output limit.

    • Oct 28, 2026 Gemini 4 Carbon

      Gemini 4 Carbon is a Google DeepMind frontier model announced on 28 October 2026, two weeks after Gemini 4 Argon, with Google claiming state-of-the-art cybersecurity and long-horizon capabilities.

20242

  1. ReleaseGoogle introduces Gemini 1.5 Flash at I/O 2024

    On 14 May 2024, at Google I/O, Google introduced Gemini 1.5 Flash, a lighter and faster model distilled from Gemini 1.5 Pro, alongside a 2-million-token context window for 1.5 Pro, Project Astra and Gemma 2.

  2. ReleaseGoogle DeepMind shows Project Astra at I/O

    At Google I/O on 14 May 2024, Demis Hassabis presented Project Astra, Google DeepMind's vision for future AI assistants: a system that continuously encodes video and speech into a cacheable timeline of events.

Developed by1

Google DeepMind

Successor of1

Gemini 1.0 (Ultra, Pro, Nano)

Succeeded by1

Gemini 2.0 Flash

Powers1

Gemini app

Uses1

Transformer

Notes and sources

  1. Gemini breaks new ground with a faster model, longer context, AI agents and morehttps://blog.google/technology/ai/google-gemini-update-flash-ai-assistant-io-2024/
  2. Gemini (language model)https://en.wikipedia.org/wiki/Gemini_(language_model)

Cite this page: Gemini 1.5 Flash. TellWorld, https://www.tellworld.net/models/gemini-1-5-flash. Updated 2026-11-08