πŸ“‹ AI Changelog

OpenAI

18 active models Β· 2 deprecated Β· Official website β†’

Active Models

GPT-5.4

βœ… Active

Most capable GPT model with 1M context window and enhanced reasoning

Context: 1M
Input: $3.00/1M
Output: $12.00/1M
textvisionfunction-callingjson-mode

GPT-5.5

βœ… Active

Frontier GPT model for professional work, coding, and complex reasoning in ChatGPT and Codex

Context: 1M
Input: $5.00/1M
Output: $30.00/1M
textvisionreasoningcode+2

GPT-5.5 Pro

βœ… Active

Higher-compute GPT-5.5 variant for the most difficult reasoning and coding tasks

Context: 1M
Input: $30.00/1M
Output: $180.00/1M
textvisionreasoningcode+1

GPT-5.5 Instant

βœ… Active

Default ChatGPT model optimized for fast, accurate, concise everyday assistance and personalization

Context: 128K
Input: N/A/1M
Output: N/A/1M
textvisionweb-searchpersonalization+1

GPT-5.4 Mini

βœ… Active

Smaller GPT-5.4 variant optimized for lower latency and cost while retaining strong tool and coding performance

Context: 400K
Input: $0.75/1M
Output: $4.50/1M
textvisionfunction-callingjson-mode+1

GPT-5.4 Nano

βœ… Active

Lowest-cost GPT-5.4 family model for high-throughput classification, extraction, and lightweight agent tasks

Context: 400K
Input: $0.20/1M
Output: $1.25/1M
textfunction-callingjson-modereasoning

GPT-5.2

βœ… Active

High-performance GPT model with 512K context window

Context: 512K
Input: $1.50/1M
Output: $6.00/1M
textvisionfunction-callingjson-mode

GPT-5.1

βœ… Active

Balanced GPT-5 series model with strong reasoning capabilities

Context: 256K
Input: $1.25/1M
Output: $5.00/1M
textvisionfunction-callingjson-mode

GPT-5

βœ… Active

First model in the GPT-5 series, major leap in reasoning and knowledge

Context: 128K
Input: $2.00/1M
Output: $8.00/1M
textvisionfunction-callingjson-mode

GPT-4.1

βœ… Active

Enhanced GPT-4 with 1M context window and improved coding

Context: 1M
Input: $2.00/1M
Output: $8.00/1M
textvisionfunction-callingjson-mode

GPT-4.1 Mini

βœ… Active

Cost-effective GPT-4.1 variant with 1M context window

Context: 1M
Input: $0.40/1M
Output: $1.60/1M
textvisionfunction-callingjson-mode

GPT-4o

βœ… Active

Omni model with native multimodal capabilities

Context: 128K
Input: $2.50/1M
Output: $10.00/1M
textvisionaudiofunction-calling+1

GPT-4o Mini

βœ… Active

Small, affordable multimodal model for lightweight tasks

Context: 128K
Input: $0.15/1M
Output: $0.60/1M
textvisionfunction-callingjson-mode

o4-mini

βœ… Active

Compact reasoning model optimized for STEM and coding tasks

Context: 200K
Input: $1.10/1M
Output: $4.40/1M
textvisionreasoningfunction-calling

o3

βœ… Active

Advanced reasoning model with breakthrough performance on complex tasks

Context: 200K
Input: $10.00/1M
Output: $40.00/1M
textvisionreasoningfunction-calling

o3-mini

βœ… Active

Cost-effective reasoning model for STEM and analytical tasks

Context: 200K
Input: $1.10/1M
Output: $4.40/1M
textreasoningfunction-calling

o1

βœ… Active

First-generation reasoning model with chain-of-thought

Context: 200K
Input: $15.00/1M
Output: $60.00/1M
textvisionreasoning

o1-mini

βœ… Active

Compact reasoning model optimized for STEM tasks

Context: 128K
Input: $3.00/1M
Output: $12.00/1M
textreasoning

Deprecated Models

GPT-4 Turbo

⚠️ Deprecated

Previous flagship model, replaced by GPT-4o series

Context: 128K
Input: $10.00/1M
Output: $30.00/1M
textvisionfunction-callingjson-mode

GPT-3.5 Turbo

⚠️ Deprecated

Legacy model, replaced by GPT-4o Mini

Context: 16K
Input: $0.50/1M
Output: $1.50/1M
textfunction-calling

Change History

May 28, 2026UpdateOpenAI
GPT-5.5

ChatGPT and API update improved GPT-5.5 Instant style and removed Canvas from GPT-5.5 Instant and Thinking

May 28, 2026UpdateOpenAI
GPT-5.5 Instant

Updated in ChatGPT and the API for more natural, better-paced responses with fewer overly long or bullet-heavy answers

May 28, 2026DeprecationOpenAI
o3

OpenAI announced that o3 will be retired from ChatGPT on August 26, 2026 after a 90-day sunset period

May 5, 2026New ReleaseOpenAI
GPT-5.5 Instant

GPT-5.5 Instant rolled out as ChatGPT's default model for all users and as chat-latest in the API, replacing GPT-5.3 Instant

Apr 24, 2026UpdateOpenAI
GPT-5.5

GPT-5.5 became available in the API with a 1M context window

Apr 24, 2026Pricing ChangeOpenAI
GPT-5.5

API pricing set at $5.00 per 1M input tokens and $30.00 per 1M output tokens

Apr 24, 2026UpdateOpenAI
GPT-5.5 Pro

GPT-5.5 Pro became available in the API for higher-accuracy work

Apr 24, 2026Pricing ChangeOpenAI
GPT-5.5 Pro

API pricing set at $30.00 per 1M input tokens and $180.00 per 1M output tokens

Apr 23, 2026New ReleaseOpenAI
GPT-5.5

GPT-5.5 introduced for ChatGPT and Codex as OpenAI's frontier model for complex professional work

Apr 23, 2026New ReleaseOpenAI
GPT-5.5 Pro

GPT-5.5 Pro introduced as the high-compute GPT-5.5 mode for harder questions and higher-accuracy work

Mar 18, 2026UpdateOpenAI
GPT-5.4 Mini

Rolled out in ChatGPT as Thinking access for Free and Go users and as a fallback for GPT-5.4 Thinking limits

Mar 17, 2026New ReleaseOpenAI
GPT-5.4 Mini

GPT-5.4 Mini released in the API, Codex, and ChatGPT with 400K context

Mar 17, 2026Pricing ChangeOpenAI
GPT-5.4 Mini

API pricing set at $0.75 per 1M input tokens and $4.50 per 1M output tokens

Mar 17, 2026New ReleaseOpenAI
GPT-5.4 Nano

GPT-5.4 Nano released for latency-sensitive and high-volume workloads in the API

Mar 17, 2026Pricing ChangeOpenAI
GPT-5.4 Nano

API pricing set at $0.20 per 1M input tokens and $1.25 per 1M output tokens

Mar 1, 2026Pricing ChangeOpenAI
GPT-5.4

API pricing set at $3.00 per 1M input tokens and $12.00 per 1M output tokens

Feb 15, 2026New ReleaseOpenAI
GPT-5.4

Initial release of GPT-5.4 with 1M context window

Jan 15, 2026UpdateOpenAI
GPT-5.2

Improved instruction following and reduced hallucination rate

Dec 10, 2025New ReleaseOpenAI
GPT-5.2

Initial release of GPT-5.2 with 512K context

Nov 15, 2025UpdateOpenAI
GPT-5.1

Improved multilingual performance

Oct 1, 2025New ReleaseOpenAI
GPT-5.1

Initial release of GPT-5.1

Sep 1, 2025Pricing ChangeOpenAI
GPT-5

Price reduced from $3.00/$12.00 to $2.00/$8.00

Aug 1, 2025New ReleaseOpenAI
GPT-5

GPT-5 launched β€” significant improvement over GPT-4 series

Jun 1, 2025DeprecationOpenAI
GPT-4 Turbo

Deprecated in favor of GPT-4o and GPT-5 series

May 1, 2025UpdateOpenAI
GPT-4.1

Improved function calling reliability

Apr 16, 2025New ReleaseOpenAI
o4-mini

o4-mini released with enhanced STEM reasoning capabilities

Apr 16, 2025New ReleaseOpenAI
o3

o3 launched with state-of-the-art reasoning on ARC-AGI and math benchmarks

Apr 14, 2025New ReleaseOpenAI
GPT-4.1

GPT-4.1 released with 1M context window, best-in-class coding

Apr 14, 2025New ReleaseOpenAI
GPT-4.1 Mini

GPT-4.1 Mini released alongside GPT-4.1

Jan 31, 2025New ReleaseOpenAI
o3-mini

o3-mini released as affordable reasoning model

Jan 1, 2025DeprecationOpenAI
GPT-3.5 Turbo

Deprecated β€” migrate to GPT-4o Mini

Dec 17, 2024UpdateOpenAI
o1

Full o1 model released with vision support and 200K context

Nov 20, 2024UpdateOpenAI
GPT-4o

gpt-4o-2024-11-20 with improved creative writing

Sep 12, 2024New ReleaseOpenAI
o1

o1-preview launched as first reasoning model

Sep 12, 2024New ReleaseOpenAI
o1-mini

o1-mini launched alongside o1-preview

Aug 6, 2024UpdateOpenAI
GPT-4o

gpt-4o-2024-08-06 update with structured outputs

Jul 18, 2024New ReleaseOpenAI
GPT-4o Mini

GPT-4o Mini launched as affordable alternative to GPT-4o

May 13, 2024New ReleaseOpenAI
GPT-4o

GPT-4o launched as first natively multimodal model

Apr 9, 2024New ReleaseOpenAI
GPT-4 Turbo

GPT-4 Turbo with Vision launched

Jan 25, 2024UpdateOpenAI
GPT-3.5 Turbo

gpt-3.5-turbo-0125 with improved accuracy

Mar 1, 2023New ReleaseOpenAI
GPT-3.5 Turbo

GPT-3.5 Turbo launched