OpenAI: every model, side by side

OpenAI GPT-6.1 Sol updates GPT-6 Sol for coding, computer use and document work. It accepts text, images and files, with a 1.05M-token context window and up to 128K output tokens. Five reasoning effort levels run from low through max.

conversation · reasoning · code-generation · analysis · agentic-tool-use · function-calling · planning

GPT-6 Sol sits between Astra and Luna in OpenAI's GPT-6 family. It accepts text, images, and files, with a 1.05-million-token context for professional tasks, coding, and reasoning.

conversation · reasoning · analysis · code-generation · tool-use

The fast, lower-cost tier of GPT-6 for chat, classification, and lightweight agent workflows. Luna accepts text, images, and files with the same 1.05-million-token context as Sol.

conversation · reasoning · analysis · code-generation · tool-use

GPT-6 Sol served with pro reasoning mode for more demanding tasks. It uses the same underlying model and 1.05-million-token context as Sol, with additional reasoning computation.

conversation · reasoning · analysis · code-generation · tool-use

GPT-6 Luna served with pro reasoning mode. It applies additional reasoning computation to the Luna model while retaining its text, image, and file inputs and 1.05-million-token context.

conversation · reasoning · analysis · code-generation · tool-use

The precision tier of OpenAI's GPT Image 2.5 pair and its most capable image model so far. Higher image quality than GPT Image 2, sharper detail, stronger style adherence and tighter control over edits. Built for campaign creative and polished product imagery.

image-generation

The speed tier of OpenAI's GPT Image 2.5 pair. Image quality on par with GPT Image 2 at about half the latency, with the new xhigh and max quality presets, custom sizes up to 4K and tighter subject preservation on edits. OpenAI's default recommendation for everyday API image generation.

image-generation

GPT-6 Astra served with reasoning mode set to pro, which spends a larger thinking budget per request. Same underlying model as GPT-6 Astra, same 1.05M context and 128K output ceiling, aimed at the harder end of coding, analysis and long multi-step work.

conversation · reasoning · code-generation · analysis · agentic-tool-use · function-calling · planning

OpenAI's first GPT-6 model, out September 3 2026 from what the company calls its largest training run so far. It takes 1.05M tokens of context, writes up to 128K, and exposes five reasoning effort levels from low through max. OpenAI aims it at computer use, browsing, software engineering and long multi-step work.

conversation · reasoning · code-generation · analysis · agentic-tool-use · function-calling · planning

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series, suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, with capable reasoning for its price tier.

conversation · reasoning · code-generation · analysis · agentic-tool-use

The middle tier of OpenAI's GPT-5.6 series, between Sol and Luna. For everyday coding, reasoning and agent work, at roughly half the cost of Sol.

conversation · reasoning · code-generation · analysis · agentic-tool-use

The top tier of OpenAI's GPT-5.6 series, for complex reasoning, coding and agent workflows. Strongest at command-line and multi-step coding, and at long-horizon problems.

conversation · reasoning · code-generation · analysis · planning · agentic-tool-use

GPT-5.6 Luna Pro is the same underlying model as GPT-5.6 Luna, served with reasoning mode set to pro for higher-quality responses on complex tasks.

conversation · reasoning · code-generation · analysis · agentic-tool-use

OpenAI's GPT-5.5, for complex professional work. Builds on GPT-5.4 with stronger reasoning, higher reliability and better token efficiency on hard tasks. 1M+ token context window (922K input, 128K output), text and image in.

conversation · reasoning · code-generation · analysis · agentic-tool-use

OpenAI's second-generation image model. Near-perfect typography (including non-Latin scripts), 2x faster than gpt-image-1.5, up to 2K resolution, and 'thinking' over the prompt for dense compositions.

image-generation

GPT-5.4 at a smaller size, for high-throughput work. Text and image input, with reasoning, coding and tool use intact at lower latency and cost. The intended fit is chat products, coding assistants and agent workflows running at scale.

conversation · reasoning · code-generation · analysis

The smallest and cheapest model in the GPT-5.4 family, for speed-critical, high-volume work. Text and image input. It trades reasoning depth for responsiveness, which suits classification, data extraction, ranking and sub-agent calls.

conversation · reasoning · code-generation · analysis

OpenAI's GPT-5.4, folding the Codex and GPT lines into one system. Over 1M tokens of context, 922K in and 128K out, with text and image input. The improvements land in coding, document understanding, tool use and instruction following.

conversation · reasoning · code-generation · analysis · agentic-tool-use

The Pro tier of GPT-5.4, with more reasoning compute for high-stakes work. Same unified Codex and GPT architecture, over 1M tokens of context at 922K in and 128K out, text and image input. Aimed at agentic coding, long-context workflows and multi-step problems.

conversation · reasoning · code-generation · analysis · agentic-tool-use

An update to the model most ChatGPT conversations run on. It answers with better context, refuses less often, and drops the caveats and hedging that used to interrupt a conversation. More willing to engage with nuanced topics, its prose reads cleaner, and reasoning, coding and creative work hold up.

conversation · reasoning · code-generation · analysis

OpenAI's agentic coding model at the 5.3 mark, pairing GPT-5.2-Codex software engineering with GPT-5.2's broader knowledge. Leads SWE-Bench Pro and scores well on Terminal-Bench 2.0 and OSWorld-Verified. Built for long tool-using runs, and steerable mid-execution.

conversation · reasoning · code-generation · analysis · agentic-tool-use

OpenAI's latest image generation model with strong instruction following, optional transparent backgrounds, and quality controls.

image-generation

GPT Image 1.5 with `quality=low` for faster and cheaper generations.

image-generation

GPT Image 1.5 with `quality=medium` for balanced cost and quality.

image-generation

GPT Image 1.5 with `quality=high` for maximum fidelity.

image-generation

The fast, lightweight member of the GPT-5.2 family, built for low-latency chat. Adaptive reasoning lets it think only on the harder queries, so mathematics, coding and multi-step questions get more accurate without slowing ordinary conversation. Warmer and more conversational by default than the base model.

conversation · reasoning · code-generation · analysis

The GPT-5.2 base model, with better agentic and long-context behaviour than GPT-5.1. Adaptive reasoning allocates compute per query, answering simple things quickly and spending depth on hard ones. Gains show up across mathematics, coding, science and tool calling, with more coherent long-form answers.

conversation · reasoning · code-generation · analysis

The Pro tier of GPT-5.2, aimed at agentic coding and long-context work beyond what GPT-5 Pro handled. Test-time routing and intent cues like "think hard about this" carry over, with lower hallucination and sycophancy than the previous Pro.

conversation · reasoning · code-generation · analysis

The largest Codex tier in OpenAI's GPT-5.1 line, built for coding agents that run for hours rather than turns. Training data stops in September 2024.

conversation · reasoning · code-generation · analysis

The latest of the GPT-5 series: better general reasoning, tighter instruction adherence and a more natural conversational style than GPT-5. Allocates compute adaptively, answering simple queries fast and spending longer on hard ones.

conversation · reasoning · code-generation · analysis

GPT-5.1 Chat (Instant), the fast and light member of the 5.1 family, built for low-latency chat. It still thinks selectively on harder queries, which keeps math, coding and multi-step accuracy up without slowing normal conversation.

conversation · reasoning · code-generation · analysis

A smaller, faster GPT-5.1-Codex for coding at lower latency.

conversation · reasoning · code-generation · analysis

GPT-5.1 tuned for software engineering: interactive development sessions and long independent runs, covering projects from scratch, feature work, debugging, large refactors and code review.

conversation · reasoning · code-generation · analysis

The Pro tier of GPT-5, given more test-time compute for complex, high-stakes tasks. Same routing controls and intent cues as GPT-5, with lower hallucination and sycophancy and stronger coding, writing and health answers.

conversation · reasoning · code-generation · analysis

GPT-5 retuned for Codex, OpenAI's agentic coding tool. It runs on the Responses API only, not chat completions, and its training data stops in September 2024.

conversation · reasoning · code-generation · analysis

OpenAI's GPT-5, built around step-by-step reasoning and instruction following on high-stakes work. It routes at test time and reads intent cues like "think hard about this". Hallucination and sycophancy are down against GPT-4o, with better coding, writing and health answers.

conversation · reasoning · code-generation · analysis · planning · memory · agentic-tool-use · function-calling

A compact GPT-5 for lighter reasoning, with the same instruction following and safety tuning at lower latency and cost. It is the successor to OpenAI's o4-mini.

conversation · reasoning · code-generation · analysis

The smallest model in OpenAI's GPT-5 line, priced for high-volume classification, extraction and short code edits rather than hard reasoning. Text and image input, training data through May 2024.

conversation · reasoning · code-generation · analysis

OpenAI's smaller open-weight release, 21B parameters on a mixture-of-experts design. Matches o3-mini on quality while fitting in 16GB of memory, which puts it on consumer hardware and edge devices.

conversation · reasoning · code-generation · analysis · function-calling · tool-use · planning

OpenAI's first open-weight model since GPT-2, 117B parameters on a mixture-of-experts design. Reasoning depth is configurable per request and tool use is native, aimed at agent and production workloads.

conversation · reasoning · code-generation · analysis · tool-use · function-calling

OpenAI's first generally available audio model. Features an upgraded decoder for more natural sounding voices and maintains better voice consistency. Supports both text and audio input/output.

text-to-speech · audio-generation · conversation

Cost-efficient version of GPT Audio. Features an upgraded decoder for more natural sounding voices and better voice consistency at a fraction of the cost.

text-to-speech · audio-generation · conversation

codex-mini-latest is a fine-tuned version of o4-mini specifically for use in Codex CLI. For direct use in the API, we recommend starting with gpt-4.1.

code-generation · conversation · analysis

OpenAI's reasoning model for coding, math, science and visual perception. Thinks longer before answering and reaches for tools on its own: web search, code execution, image generation. Set new SOTA on Codeforces and MMMU.

conversation · reasoning · code-generation · analysis · image-generation

A smaller, cheaper OpenAI reasoning model built for speed. Strong for its size on math, coding and visual tasks, with much higher usage limits than o3, and it can use tools on its own.

conversation · reasoning · code-generation · analysis

The same model as o4-mini, defaulting to high reasoning effort. Compact, fast and cheap, keeping the multimodal and agentic behaviour, especially on math, coding and visual tasks.

conversation · reasoning · code-generation · analysis

OpenAI's GPT-4.1, built around a 1 million token context window and precise code diffs. Scores 54.6% on SWE-bench Verified and 87.4% on IFEval, and beats GPT-4o on coding, instruction compliance and long-document recall.

conversation · reasoning · code-generation · analysis

The smallest and cheapest model in the GPT-4.1 line, with the same 1 million token context. Scores 80.1% on MMLU, 50.3% on GPQA and 9.8% on Aider polyglot, above GPT-4o mini. Aimed at classification and autocompletion.

conversation · reasoning · code-generation · analysis

The mid tier of the GPT-4.1 line, roughly GPT-4o quality at lower latency and cost, with the same 1 million token context. Scores 84.1% on IFEval, 35.8% on MultiChallenge and 31.6% on Aider's polyglot diff benchmark, and handles vision.

conversation · analysis · code-generation

The March 2025 refresh of GPT-4o in ChatGPT. Follows instructions more closely, handles coding with fewer detours, and writes shorter answers with fewer nested markdown levels than the previous build.

conversation · reasoning · analysis · code-generation

GPT-4o with audio input support. Detects nuances within audio recordings and adds depth to generated user experiences. Processes both text and audio prompts.

text-to-speech · audio-generation · conversation

GPT-4.5 scaled up pre-training and post-training. Broader knowledge, better intent reading and more 'EQ' on conversation, writing, programming and practical problems, with fewer hallucinations. Scored 62.5% on SimpleQA with a 37.1% hallucination rate, ahead of GPT-4o.

conversation · reasoning · code-generation · analysis · summarization

A smaller, cheaper o3 with faster response times. OpenAI says output quality holds.

conversation · reasoning · code-generation

o1 achieves 86% accuracy on Mathematics Olympiad benchmarks (vs. GPT-4o's 13%), offers PhD-level STEM proficiency, and is built with extensive alignment training and safety evaluation.

conversation · web-design · code-generation · reasoning

OpenAI's small model after GPT-4 Omni: text and image in, text out. Many multiples cheaper than the frontier models of its day and over 60% cheaper than GPT-3.5 Turbo, at close to SOTA intelligence.

conversation · reasoning · code-generation · analysis

GPT-4o processes text, images, and audio through a unified transformer architecture and offers real-time translation for 154 languages with 89.2% BLEU score on low-resource languages.

conversation · reasoning · analysis · code-generation · image-generation

OpenAI's high-definition text-to-speech with six built-in voices. Clear and natural, at the cost of latency.

text-to-speech · audio-generation

GPT-4 Turbo as it reached general availability in April 2024: GPT-4 with a 128K context window, image input, JSON mode and training data through December 2023, at a lower price than the original. It was OpenAI's flagship until GPT-4o arrived in May 2024.

conversation · reasoning · code-generation · analysis

OpenAI's standard text-to-speech, tuned for low latency. Six voices, several output formats. Faster than TTS-1-HD and slightly rougher.

text-to-speech · audio-generation

DALL-E 3 auto-improves user inputs via ChatGPT integration and blocks prohibited content with 99.9% precision using multimodal classifiers.

image-generation

The original GPT-4: a large multimodal model that handled hard problems more accurately than GPT-3.5 on the strength of broader general knowledge and better reasoning. Training data stops at September 2021.

conversation · reasoning · code-generation · analysis

OpenAI's fastest model of its generation. Understands and writes natural language and code, tuned for chat and completion.

conversation · code-generation

A direct scale-up of GPT-1 with 1.5 billion parameters, trained on 8 million web pages. Known for its ability to generate coherent text, sometimes indistinguishable from humans, but could be repetitive.

conversation · summarization · analysis

The first large-scale transformer-based language model released by OpenAI, trained on the BooksCorpus dataset. This version is accessed via the Hugging Face model hub (`openai-community/openai-gpt`).

conversation · summarization