AI Radar

GPT-3.5 Turbo

Deprecated · Language

GPT-3.5 Turbo is an OpenAI language model released in the API on 1 March 2023 as gpt-3.5-turbo, which OpenAI said was the model used in the ChatGPT product, and first marketed as the ChatGPT API. It came with a chat endpoint that takes a list of messages and was priced at one tenth of OpenAI's existing GPT-3.5 models. [1] Primary source

Timeline of GPT-3.5 Turbo →

Claims and evidence

  • Released The live announcement shows only its update date (April 24, 2024); the day comes from the original post as archived on 2023-03-01. The first snapshot released that day is gpt-3.5-turbo-0301. Primary source[1]date line of the original post (archive capture of 2023-03-01); GPT-3.5 API: Model; ChatGPT upgrades [2]Model deprecations: the initial versions announced in March
  • Deprecated Primary source[3]2026-04-22: Legacy GPT model snapshots
  • gpt-3.5-turbo-0613 with function calling and the 16K-context gpt-3.5-turbo-16k released Primary source[2]GPT-3.5 Turbo
  • Fine-tuning for GPT-3.5 Turbo available Primary source[4]first paragraph
  • gpt-3.5-turbo-1106 released with a 16K context window by default Primary source[5]Updated GPT-3.5 Turbo [6]Nov 6, 2023
  • gpt-3.5-turbo-0125 released Primary source[6]Feb 1, 2024
  • Replaced by GPT-4o mini in ChatGPT Primary source[7]Availability and pricing
  • Status Deprecatedgpt-3.5-turbo (default snapshot gpt-3.5-turbo-0125) is scheduled to shut down in the API on October 23, 2026. Older snapshots are already shut down: gpt-3.5-turbo-0301, -0613 and -16k-0613 on 2024-09-13, gpt-3.5-turbo-1106 on 2026-09-28. Primary source[3]2026-04-22: Legacy GPT model snapshots
  • Replaced by GPT-5.6 TerraSubstitute model listed for gpt-3.5-turbo-0125 on the deprecations page when checked on 2026-10-01. The model page has recommended gpt-4o-mini in place of GPT-3.5 Turbo since July 2024. Primary source[3]2026-04-22: Legacy GPT model snapshots
  • Successor of ChatGPT EditorialEditorial link: the API announcement presents gpt-3.5-turbo as the ChatGPT model family, the same model used in the ChatGPT product, and names no predecessor. Primary source[1]GPT-3.5 API: Model
  • Change · Availability Makes the ChatGPT model available to developers through the OpenAI API, with dated snapshots such as gpt-3.5-turbo-0301 for pinning a version.Compared with ChatGPT Primary source[1]
  • Change · Efficiency OpenAI reported a 90 percent cost reduction for ChatGPT since December 2022 through system-wide optimisations and passed the savings on to API users.Compared with ChatGPT Primary source[1]
  • Change · Tool use Function calling was added with the gpt-3.5-turbo-0613 snapshot on 13 June 2023.Compared with ChatGPT Primary source[2]
  • Input text Primary source[8]Model details
  • Output text Primary source[8]Model details
  • Feature Function callingFrom gpt-3.5-turbo-0613 (2023-06-13). Primary source[2]Function calling; GPT-3.5 Turbo
  • Feature Fine tuning availableFrom 2023-08-22. Primary source[4]first paragraph [8]Supported features
  • Context window 16,385 tokensFor the default snapshot gpt-3.5-turbo-0125. The June 2023 post calls the original model the standard 4k version; a 16K version followed on 2023-06-13 and became the default with gpt-3.5-turbo-1106. Primary source[8]Model details
  • Parameters Not disclosedNot disclosed by OpenAI. No claim madeNo source
  • Access API, consumer appThe API announcement says gpt-3.5-turbo is the model used in the ChatGPT product; in ChatGPT it was offered as GPT-3.5 until GPT-4o mini took its place on 2024-07-18. Primary source[1]GPT-3.5 API: Model [7]Availability and pricing

Lineage

Predecessors

Successors

Based on

Not derived from another model.

Variants and derived

None recorded.

Siblings

None recorded.

All ancestors

All descendants

Variants

gpt-3.5-turbo-instruct

  • Announced Primary source[3]2023-07-06: GPT and embeddings [10]Deprecation of older models in the Completions API
  • Deprecated Primary source[3]2025-09-26: Legacy GPT model snapshots
  • Retired Primary source[3]2025-09-26: Legacy GPT model snapshots
  • Variant Inline variant in this record.Completions-only model announced as an InstructGPT-style drop-in replacement for older completion models such as text-davinci-003; the GPT-3.5 Turbo model page lists it among its snapshots. The July 2023 post said it would be available in the coming weeks; no source read gives the release day. Primary source[9] [8]Snapshots

Status: Retired Evidence not assessed [3]2025-09-26: Legacy GPT model snapshots

Differs in:

  • Context window: 4,096 tokens Evidence not assessed [9]Model details

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