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TL;DR - GPT-5.4 mini and nano
- OpenAI's fastest small models: mini ($0.75/1M input) near full GPT-5.4 performance, nano ($0.20/1M input) for high-volume tasks
- Both feature 400K context windows, 128K max output, and support for function calling, web search, and code interpretation
- Released March 2026; available in ChatGPT free tier (mini), Codex, and the OpenAI API
Pricing: Free plan available
Best for: Growing teams
Pros & Cons
Pros
- GPT-5.4 mini approaches full GPT-5.4 performance at a fraction of the cost
- Nano model at $0.20/1M input tokens is extremely cost-effective for high-volume tasks
- 400K context window handles large documents and codebases
- 2x faster than previous generation mini models
- Available across ChatGPT (free tier), Codex, and API
- Cached input pricing at $0.075/1M tokens (mini) makes repeated queries very cheap
Cons
- August 2025 knowledge cutoff means no awareness of recent events
- Nano lacks some advanced capabilities like computer use
- Text-only output (no native image or audio generation)
- Mini at $4.50/1M output tokens can get expensive for verbose tasks
- Smaller models may still hallucinate more than full GPT-5.4
Key Features
400,000-token context window on both models128,000 maximum output tokensText and image input supportFunction calling and structured outputsWeb search, file search, and code interpretation toolsStreaming and batch processing supportComputer use capability (mini)Reasoning token support for chain-of-thoughtRealtime API compatibility90% discount on cached input tokens
Pricing
Freemium
GPT-5.4 mini and nano offers a generous free tier with optional paid upgrades for advanced features.
About GPT-5.4 mini and nano
By Toolradar Team·
GPT-5.4 mini and nano are OpenAI's latest compact language models, released March 2026. GPT-5.4 mini ($0.75/1M input tokens) delivers near-GPT-5.4 performance at 2x faster speed, excelling at coding, reasoning, multimodal understanding, and tool use. GPT-5.4 nano ($0.20/1M input tokens) is the smallest and cheapest option, optimized for classification, data extraction, and subagent tasks. Both feature 400K context windows and August 2025 knowledge cutoff.
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GPT-5.4 mini and nano FAQ
What is the difference between GPT-5.4 mini and nano?
GPT-5.4 mini ($0.75/1M input, $4.50/1M output) is the more capable model, approaching full GPT-5.4 performance on coding, reasoning, and tool use benchmarks. GPT-5.4 nano ($0.20/1M input, $1.25/1M output) is smaller and cheaper, optimized for classification, data extraction, ranking, and coding subagent tasks where speed and cost matter most.
What is the context window for these models?
Both GPT-5.4 mini and nano support a 400,000-token context window with up to 128,000 output tokens. They also support reasoning tokens for chain-of-thought processing.
Are GPT-5.4 mini and nano available for free?
GPT-5.4 mini is available to free-tier ChatGPT users and Go plan subscribers. Both models are available through the OpenAI API on a pay-per-use basis. GPT-5.4 nano is API-only.
What is the knowledge cutoff?
Both models have an August 31, 2025 knowledge cutoff. For information beyond that date, they can use the web search tool when available.
How do these models compare to GPT-5.4?
GPT-5.4 mini approaches the full GPT-5.4 on benchmarks like SWE-Bench Pro and OSWorld-Verified while running 2x faster and costing significantly less. Nano trades some capability for even greater speed and cost savings, making it ideal for high-volume automated tasks.
What tools and capabilities do they support?
Both support function calling, structured outputs, streaming, and batch processing. Through the Responses API, they access web search, file search, image generation, code interpretation, and shell access. GPT-5.4 mini also supports computer use.
Source: openai.com