OpenAI Discontinues Fine-Tuning and Legacy Models, Introduces GPT-4.5 and New o3-mini Pricing for Enhanced Accessibility
What happened
Between the Oct 1, 2024 and Mar 9, 2025 captures of OpenAI's pricing page, Pulse recorded 15 changes: Fine-tuning for gpt-3.5-turbo, davinci-002, and babbage-002 models removed; Legacy models section removed (chatgpt-4o-latest, gpt-4-turbo, gpt-4, gpt-4-32k, gpt-3.5-turbo variants, davinci-002, babbage-002); Small reasoning model pricing decreased 63%: o1-mini ($3 input / $12 output) replaced by o3-mini ($1.10 input / $4.40 output) per 1M tokens; o1 reasoning models context length increased from 128K to 200K tokens; Realtime API added for low-latency multimodal experiences including speech-to-speech; GPT-4.5 model added for creative tasks and agentic planning at $75 input / $150 output per 1M tokens (research preview); Assistants API tool pricing removed (Code Interpreter $0.03/session, File Search $0.10/GB/day); OpenAI o1 frontier reasoning model added with tools, Structured Outputs, and vision support (200k context) at $15 input / $60 output per 1M tokens; o1-mini model discontinued (replaced by o3-mini); Cached input pricing introduced offering 50% discount on cached inputs across multiple models; OpenAI o3-mini small reasoning model added at $1.10 input / $4.40 output per 1M tokens; Image generation models section removed (DALL·E 3 Standard, HD, DALL·E 2); Embedding models section removed (text-embedding-3-small, text-embedding-3-large, ada v2); o1-preview model discontinued (replaced by o1); Audio models section removed (Whisper, TTS, TTS HD). Pulse files it as a pricing change (plan removed, price decrease, limit increase, new add-on, new plan, feature removed, feature added) with a downward direction. Pulse's latest capture (Oct 18, 2026) lists Go at $8, Plus at $20, Business at $20 and Pro at $100.
OpenAI's previous recorded change was "OpenAI Launches Cost-Effective GPT-4o Mini Model at $0.150/1M Input Tokens, Revolutionizing AI Accessibility" (Q3 2024). OpenAI has been tracked since 2023-11-14.
In the same window Metabase and Anthropic also changed their AI & Machine Learning pricing pages. Those moves are listed further down, and the Pulse Agent can compare them side by side.
- — · PlanPlan removed
Fine-tuning for gpt-3.5-turbo, davinci-002, and babbage-002 models removed
- — · PlanPlan removed
Legacy models section removed (chatgpt-4o-latest, gpt-4-turbo, gpt-4, gpt-4-32k, gpt-3.5-turbo variants, davinci-002, babbage-002)
- — · PricePrice decrease
Small reasoning model pricing decreased 63%: o1-mini ($3 input / $12 output) replaced by o3-mini ($1.10 input / $4.40 output) per 1M tokens
- — · Limit+56%128K200K tokens
- — · Add-onAddedNo Realtime APIRealtime API
- — · PlanAddedNo GPT-4.5 modelGPT-4.5 model
- — · FeatureFeature removed
Assistants API tool pricing removed (Code Interpreter $0.03/session, File Search $0.10/GB/day)
- — · PlanAdded
BeforeNot listed
AfterOpenAI o1 frontier reasoning model
- — · PlanPlan removed
o1-mini model discontinued (replaced by o3-mini)
- — · FeatureAddedNo offering 50% discountoffering 50% discount
- — · PlanAdded
BeforeNot listed
AfterOpenAI o3-mini small reasoning model
- — · PlanPlan removed
Image generation models section removed (DALL·E 3 Standard, HD, DALL·E 2)
- — · PlanPlan removed
Embedding models section removed (text-embedding-3-small, text-embedding-3-large, ada v2)
- — · PlanPlan removed
o1-preview model discontinued (replaced by o1)
- — · PlanPlan removed
Audio models section removed (Whisper, TTS, TTS HD)
| Plan | Field | Before | After | Change |
|---|---|---|---|---|
| — | Plan | Fine-tuning for gpt-3.5-turbo, davinci-002, and babbage-002 models removed | Plan removed | |
| — | Plan | Legacy models section removed (chatgpt-4o-latest, gpt-4-turbo, gpt-4, gpt-4-32k, gpt-3.5-turbo variants, davinci-002, babbage-002) | Plan removed | |
| — | Price | Small reasoning model pricing decreased 63%: o1-mini ($3 input / $12 output) replaced by o3-mini ($1.10 input / $4.40 output) per 1M tokens | Price decrease | |
| — | Limit | 128K | 200K tokens | +56% |
| — | Add-on | No Realtime API | Realtime API | Added |
| — | Plan | No GPT-4.5 model | GPT-4.5 model | Added |
| — | Feature | Assistants API tool pricing removed (Code Interpreter $0.03/session, File Search $0.10/GB/day) | Feature removed | |
| — | Plan | Not listed | OpenAI o1 frontier reasoning model | Added |
| — | Plan | o1-mini model discontinued (replaced by o3-mini) | Plan removed | |
| — | Feature | No offering 50% discount | offering 50% discount | Added |
| — | Plan | Not listed | OpenAI o3-mini small reasoning model | Added |
| — | Plan | Image generation models section removed (DALL·E 3 Standard, HD, DALL·E 2) | Plan removed | |
| — | Plan | Embedding models section removed (text-embedding-3-small, text-embedding-3-large, ada v2) | Plan removed | |
| — | Plan | o1-preview model discontinued (replaced by o1) | Plan removed | |
| — | Plan | Audio models section removed (Whisper, TTS, TTS HD) | Plan removed | |
Values as written on OpenAI's public pricing page in the two captures Pulse compared; where the page states no number, the cells give the wording before and after.
Evidence
The two captures Pulse comparedFull-page captures of OpenAI's pricing page (openai.com) from Oct 1, 2024 and Mar 9, 2025; the change is marked on the page, where limit reads 128K and then 200K tokens.
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The two full-page captures with this change marked up are free with an account.
OpenAI, the last 90 days
Full history- Q3 2025packagingOpenAI API Introduces GPT-5 Mini and Nano Models with Significantly Lower Pricing, Enhancing Accessibility for Users
- Q2 2025packagingOpenAI Announces Dramatic 87% Price Drop for Flagship Reasoning Model Outputs During Transition to o3
- Mar 2025packagingOpenAI Introduces Tiered Pricing for Web Search Tool Calls, Impacting GPT-4o and GPT-4o Mini Rates
- Q4 2024packagingOpenAI Discontinues Fine-Tuning and Legacy Models, Introduces GPT-4.5 and New o3-mini Pricing for Enhanced Accessibility · this change
- Q3 2024packagingOpenAI Launches Cost-Effective GPT-4o Mini Model at $0.150/1M Input Tokens, Revolutionizing AI Accessibility
Across AI & Machine Learning in the same window
All AI & Machine Learning changes- MetabaseJan 12Metabase Introduces SCIM Account Provisioning for Pro and Enterprise Plans
- AnthropicJan 10Anthropic API Introduces Tiered Pricing and Prompt Caching for Sonnet 4.5, Restructuring Costs Based on Token Length
- MetabaseJan 12Metabase Unifies Pricing Structure with Monthly/Annual Toggle and 'Save 10%' Offer
- MetabaseJan 12Metabase Cuts Storage Add-On Pricing by 53% for 500K and 1M Rows, Now Just $35 and $70/Month
- MetabaseJan 12Metabase Raises Enterprise Plan Minimum Annual Price by 33% to $20k, Alongside Other Price Increases Across Plans and Add-ons
Questions about this change
Did OpenAI raise prices in March 2025?
No — prices went down. Between Oct 1, 2024 and Mar 9, 2025 OpenAI's pricing page showed 1 price cut: Small reasoning model pricing decreased 63%: o1-mini ($3 input / $12 output) replaced by o3-mini ($1.10 input / $4.40 output) per 1M tokens.
What changed on OpenAI's pricing page between Oct 1, 2024 and Mar 9, 2025?
Fine-tuning for gpt-3.5-turbo, davinci-002, and babbage-002 models removed; Legacy models section removed (chatgpt-4o-latest, gpt-4-turbo, gpt-4, gpt-4-32k, gpt-3.5-turbo variants, davinci-002, babbage-002); Small reasoning model pricing decreased 63%: o1-mini ($3 input / $12 output) replaced by o3-mini ($1.10 input / $4.40 output) per 1M tokens; limit: 128K → 200K tokens (+56%); add-on: No Realtime API → Realtime API, added; plan: No GPT-4.5 model → GPT-4.5 model, added; Assistants API tool pricing removed (Code Interpreter $0.03/session, File Search $0.10/GB/day); plan: Not listed → OpenAI o1 frontier reasoning model, added; o1-mini model discontinued (replaced by o3-mini); feature: No offering 50% discount → offering 50% discount, added; plan: Not listed → OpenAI o3-mini small reasoning model, added; Image generation models section removed (DALL·E 3 Standard, HD, DALL·E 2); Embedding models section removed (text-embedding-3-small, text-embedding-3-large, ada v2); o1-preview model discontinued (replaced by o1); Audio models section removed (Whisper, TTS, TTS HD). Pulse compared the captures it took on Oct 1, 2024 and Mar 9, 2025; the before/after table above lists each item as written on the page.
How often does OpenAI change its pricing?
Pulse recorded 1 other pricing-page change for OpenAI in the 90 days before this one; the previous change was "OpenAI Launches Cost-Effective GPT-4o Mini Model at $0.150/1M Input Tokens, Revolutionizing AI Accessibility" in Q3 2024; OpenAI has been tracked since 2023-11-14.