Full Changelog

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

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

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

Claude Opus 4.8 released as Anthropic's latest high-capability model with a 1M context window

Pricing remains $5.00 per 1M input tokens and $25.00 per 1M output tokens

DeepSeek scheduled deepseek-chat and deepseek-reasoner compatibility aliases for retirement on June 15, 2026

Gemini 3.5 Flash released for Gemini API and Vertex AI with updated multimodal and reasoning performance

API pricing listed at $1.50 per 1M input tokens and $9.00 per 1M output tokens

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

Mistral Medium 3.5 released as the latest Medium family model with 262K context

Pricing set at $1.50 per 1M input tokens and $7.50 per 1M output tokens

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

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

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

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

DeepSeek V4 Pro released for API access with stronger reasoning, coding, and tool-use performance

Promotional API pricing listed at $0.50 per 1M input tokens and $1.50 per 1M output tokens

DeepSeek V4 Flash released alongside V4 Pro for faster and lower-cost API workloads

Pricing set at $0.14 per 1M input tokens and $0.28 per 1M output tokens

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

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

Gemini Embedding 2 made generally available for text embedding workloads

Meta confirmed Llama 4 Behemoth was still in training, leaving Maverick and Scout as the current released Llama 4 models

Claude Opus 4.7 released with a 1M context window, stronger tool use, and improved agentic coding performance

Pricing set at $5.00 per 1M input tokens and $25.00 per 1M output tokens

Claude Mythos Preview introduced as a gated research preview through Anthropic's Project Glasswing security initiative

Preview participant pricing listed at $25.00 per 1M input tokens and $125.00 per 1M output tokens after included usage credits

Voxtral TTS released for speech generation and voice output use cases

Gemini 3.1 Flash Live introduced for realtime audio and multimodal sessions

Leanstral released for formal mathematics and Lean-assisted reasoning tasks

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

Gemini 3.1 Flash-Lite released for cost-sensitive, low-latency Gemini workloads

Mistral Small 4 released as the latest cost-efficient Small family model with 256K context

Pricing set at $0.15 per 1M input tokens and $0.45 per 1M output tokens

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

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

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

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

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

Claude Opus 4.6 launched with improved reasoning and coding

Claude Sonnet 4.6 released alongside Opus 4.6

Gemini 3.1 Pro released with 2M context and enhanced reasoning

Initial release of GPT-5.4 with 1M context window

DeepSeek V3.2 released with improved reasoning and efficiency

Improved instruction following and reduced hallucination rate

Claude Opus 4.5 released with improved creative writing

Claude Sonnet 4.5 launched with improved coding performance

Initial release of GPT-5.2 with 512K context

Gemini 3 Pro launched with breakthrough multimodal capabilities

Gemini 3 Flash released with significantly improved speed

Improved multilingual performance

Claude Haiku 4.5 released with improved speed and capability

Deprecated in favor of Claude Haiku 4.5

Initial release of GPT-5.1

Claude Opus 4 launched as most capable Claude model to date

Claude Sonnet 4 launched alongside Opus 4

DeepSeek V3.1 released with improved instruction following

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

Deprecated in favor of Claude 4 Opus

Deprecated in favor of Gemini 2.5+ series

GPT-5 launched — significant improvement over GPT-4 series

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

Updated to gemini-2.5-pro-preview-06-05 with improved performance

R1-0528 released with significant improvements in math reasoning

Improved function calling reliability

Gemini 2.5 Flash released with thinking capabilities at Flash pricing

o4-mini released with enhanced STEM reasoning capabilities

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

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

GPT-4.1 Mini released alongside GPT-4.1

Llama 4 Maverick released as open-source 400B MoE model

Llama 4 Scout launched with industry-leading 10M token context

Gemini 2.5 Pro launched with built-in thinking capability

Claude 3.7 Sonnet launched with extended thinking capability

All Gemini 1.0 models deprecated

R1 API pricing reduced significantly

Gemini 2.0 Flash GA with stable API

o3-mini released as affordable reasoning model

Mistral Small 25.01 update with better performance

V3 API generally available with 128K context

DeepSeek R1 released as open-source reasoning model, rivaling o1

Mistral Medium relaunched with improved architecture

Codestral 25.01 with 256K context and improved performance

Deprecated — migrate to GPT-4o Mini

DeepSeek V3 launched, trained for just $5.6M

Full o1 model released with vision support and 200K context

Gemini 2.0 Flash experimental released

Llama 3.3 70B released, matching 405B quality at lower cost

Deprecated — migrate to Llama 3.x series

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

mistral-large-2411 update with improved instruction following

Pixtral Large 124B released with native multimodal understanding

Updated Claude 3.5 Sonnet with computer use capability

Context window expanded to 2M tokens

Mistral Small 24B released

o1-preview launched as first reasoning model

o1-mini launched alongside o1-preview

Quantized and distilled variants released by community

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

Mistral Large 2 (123B) released with 128K context

Llama 3.1 released in 8B, 70B, and 405B variants

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

Claude 3.5 Sonnet launched, outperforming Claude 3 Opus

Codestral launched as first dedicated Mistral coding model

GPT-4o launched as first natively multimodal model

GPT-4 Turbo with Vision launched

Claude 3 Haiku launched as fastest Claude model

Claude 3 Opus launched as part of Claude 3 family

Gemini 1.5 Pro launched with revolutionary 1M context window

gpt-3.5-turbo-0125 with improved accuracy

Gemini 1.0 launched in Ultra, Pro, and Nano variants

Llama 2 released in 7B, 13B, and 70B variants

GPT-3.5 Turbo launched