OpenAI
24 active models Β· 2 deprecated Β· Official website β
Active Models
GPT-6 Astra
β ActiveOpenAI's frontier GPT-6 model, described as its most intelligent and aligned model, with cyber-sensitive capabilities gated behind a trusted-access program
GPT-6 Sol
β ActiveGPT-6 workhorse model approaching GPT-6 Astra reliability at a fraction of the cost, with roughly half the factual errors of GPT-5.6 Sol
GPT-6 Luna
β ActiveFast, cost-efficient GPT-6 model for high-volume chat, classification, and lightweight agentic tasks, with a new $0.10 per 1M input price floor
GPT-5.6 Sol
β ActiveFlagship of the GPT-5.6 family for complex reasoning, coding, and agentic workloads; succeeded by GPT-6 Sol
GPT-5.6 Terra
β ActiveBalanced GPT-5.6 model for everyday work, competitive with GPT-5.5 at half the cost
GPT-5.6 Luna
β ActiveMost cost-efficient GPT-5.6 model for high-throughput tasks; succeeded by GPT-6 Luna
GPT-5.4
β ActiveMost capable GPT model with 1M context window and enhanced reasoning
GPT-5.5
β ActiveFrontier GPT model for professional work, coding, and complex reasoning in ChatGPT and Codex
GPT-5.5 Pro
β ActiveHigher-compute GPT-5.5 variant for the most difficult reasoning and coding tasks
GPT-5.5 Instant
β ActiveDefault ChatGPT model optimized for fast, accurate, concise everyday assistance and personalization
GPT-5.4 Mini
β ActiveSmaller GPT-5.4 variant optimized for lower latency and cost while retaining strong tool and coding performance
GPT-5.4 Nano
β ActiveLowest-cost GPT-5.4 family model for high-throughput classification, extraction, and lightweight agent tasks
GPT-5.2
β ActiveHigh-performance GPT model with 512K context window
GPT-5.1
β ActiveBalanced GPT-5 series model with strong reasoning capabilities
GPT-5
β ActiveFirst model in the GPT-5 series, major leap in reasoning and knowledge
GPT-4.1
β ActiveEnhanced GPT-4 with 1M context window and improved coding
GPT-4.1 Mini
β ActiveCost-effective GPT-4.1 variant with 1M context window
GPT-4o
β ActiveOmni model with native multimodal capabilities
GPT-4o Mini
β ActiveSmall, affordable multimodal model for lightweight tasks
o4-mini
β ActiveCompact reasoning model optimized for STEM and coding tasks
o3
β ActiveAdvanced reasoning model with breakthrough performance on complex tasks
o3-mini
β ActiveCost-effective reasoning model for STEM and analytical tasks
o1
β ActiveFirst-generation reasoning model with chain-of-thought
o1-mini
β ActiveCompact reasoning model optimized for STEM tasks
Deprecated Models
Change History
GPT-6 Luna released with a 1,050,000-token context window, 128K max output, and a May 18, 2026 knowledge cutoff; supports reasoning effort from none to max
API pricing set at $0.10 per 1M input tokens and $0.50 per 1M output tokens, half of GPT-5.6 Luna; cached input $0.01 per 1M tokens
GPT-6 Astra rolled out to paid ChatGPT users in a restricted version that declines certain cybersecurity prompts
GPT-6 Astra unveiled and released as a limited preview with a 1,050,000-token context window, 128K max output, and an April 30, 2026 knowledge cutoff; OpenAI says it meets the Critical cybersecurity threshold under its Preparedness Framework
API pricing set at $10.00 per 1M input tokens and $50.00 per 1M output tokens (2.5x GPT-5.6 Sol); cached input $1.00, Batch at half price, Fast mode at 2x; requests above about 272K input tokens billed at $20.00 input and $75.00 output
API and credit pricing cut by more than 20% to $4.00 per 1M input tokens and $20.00 per 1M output tokens for three months, through at least November 21, 2026
Price reduced 20% to $2.00 per 1M input tokens and $12.00 per 1M output tokens
Price reduced 80% to $0.20 per 1M input tokens and $1.20 per 1M output tokens
GPT-5.6 Sol released to the public as OpenAI's flagship and strongest coding and cybersecurity model, introducing the Sol/Terra/Luna capability-tier naming
Launch pricing set at $5.00 per 1M input tokens and $30.00 per 1M output tokens; Fast mode on Cerebras at $12.50 input and $75.00 output
GPT-5.6 Terra released as the mid-tier GPT-5.6 model, replacing the former mini tier
Launch pricing set at $2.50 per 1M input tokens and $15.00 per 1M output tokens
GPT-5.6 Luna released as the fastest and lowest-cost GPT-5.6 model, replacing the former nano tier
Launch pricing set at $1.00 per 1M input tokens and $6.00 per 1M output tokens
GPT-5.6 Sol, Terra, and Luna made available as a limited preview to about 20 trusted partner organizations while under U.S. government review
Updated in ChatGPT and the API for more natural, better-paced responses with fewer overly long or bullet-heavy answers
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
API pricing set at $30.00 per 1M input tokens and $180.00 per 1M output tokens
GPT-5.5 Pro introduced as the high-compute GPT-5.5 mode for harder questions and higher-accuracy work
Rolled out in ChatGPT as Thinking access for Free and Go users and as a fallback for GPT-5.4 Thinking limits
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