What is GPT-5.4?

GPT-5.4 is OpenAI’s most capable frontier model, released on March 5, 2026. It features a 1.05 million token context window (the largest OpenAI has offered), reduces factual errors by 33% compared to GPT-5.2, and introduces Tool Search—a new system for efficient multi-tool calling. It comes in three variants: Standard, Thinking, and Pro.

Last verified: March 2026

Key Specs

Feature	GPT-5.4
Released	March 5, 2026
Context window	1.05M tokens
Factual accuracy	33% fewer claim errors vs GPT-5.2
GDPval score	83% (record for knowledge work)
Input price	$2.50/1M tokens
Output price	$15.00/1M tokens
Variants	Standard, Thinking, Pro

The Three Variants

GPT-5.4 (Standard)

The default model for general use. Best balance of speed, quality, and cost. Use this for most tasks—writing, analysis, coding, conversation.

GPT-5.4 Thinking

A reasoning-first variant that shows its work. Like previous “o-series” reasoning models, it takes more time but handles complex logic, math, and multi-step problems better. Choose this when accuracy on hard problems matters more than speed.

GPT-5.4 Pro

Maximum capability for the most demanding professional tasks. Higher cost, longer processing time, but the best results on complex research, analysis, and code generation. Available to ChatGPT Pro subscribers ($200/month).

What’s New

1.05M Token Context Window

The largest context window OpenAI has ever shipped. You can feed entire codebases, long documents, or months of conversation history into a single prompt. Standard pricing applies up to 272K tokens, with a 2× surcharge beyond that.

33% Fewer Factual Errors

OpenAI measured individual claim accuracy and found GPT-5.4 reduces errors by 33% per claim and 18% per full response compared to GPT-5.2. This is a significant improvement for factual tasks like research and analysis.

Tool Search (New Architecture)

The biggest technical innovation. Previous models loaded all tool definitions into the prompt, consuming tokens and increasing latency. Tool Search lets GPT-5.4 dynamically look up tool definitions as needed—reducing cost and improving speed for apps with many tools.

This matters for developers building complex AI agents that use dozens of APIs and tools.

83% GDPval Score

A record score on OpenAI’s internal benchmark for knowledge work, measuring performance on real-world professional tasks across multiple domains.

Pricing

Context	Input	Output
Up to 272K tokens	$2.50/1M tokens	$15.00/1M tokens
272K - 1.05M tokens	$5.00/1M tokens	$30.00/1M tokens

For comparison:

• Claude Opus 4.6: $15/$75 per 1M tokens (6× more expensive for input)
• Gemini 3.1 Pro: $2/$12 per 1M tokens (slightly cheaper)

GPT-5.4 sits in the middle—cheaper than Claude Opus, slightly more than Gemini, with the largest context window.

GPT-5.4 vs Claude Opus 4.6

The biggest rivalry in AI right now. Quick summary from March 2026 benchmarks:

• GPT-5.4 wins: Tool calling accuracy, general knowledge, multimodal tasks, price
• Claude Opus 4.6 wins: Complex coding (75.6% SWE-bench), agentic workflows, writing quality
• Tie: Context window (both ~1M tokens)

Most developers aren’t choosing one—they’re using both for different tasks.

How to Access GPT-5.4

Access Method	Availability
ChatGPT Plus	$20/month (Standard + Thinking)
ChatGPT Pro	$200/month (all variants + higher limits)
API	Pay-per-token (all variants)
Azure OpenAI	Enterprise access

FAQ

Is GPT-5.4 better than Claude Opus 4.6?

For general tasks, tool calling, and value—yes. For complex coding and agentic workflows—Claude Opus 4.6 still leads. Benchmarks show GPT-5.4 wins 5 categories while Claude wins 3, but Claude’s wins are in high-value areas like programming and code quality.

What’s the difference between GPT-5.4 and GPT-5.4 Thinking?

Standard GPT-5.4 gives fast, good responses. GPT-5.4 Thinking takes more time to reason through complex problems—similar to how o1/o3 models worked. Use Thinking for math, logic, and multi-step analysis.

Is GPT-5.4 worth upgrading from GPT-5.2?

Yes. The 33% error reduction, 1M token context window, and Tool Search are substantial improvements. If you’re building applications on the OpenAI API, the upgrade is straightforward and pricing is similar.

Can I use GPT-5.4 for free?

ChatGPT free tier uses an older model. GPT-5.4 requires ChatGPT Plus ($20/month) or API access. There’s no free tier for 5.4 specifically.

What is Tool Search?

A new feature that lets GPT-5.4 dynamically look up tool/API definitions rather than loading them all into the prompt. This reduces token usage and latency for applications with many tools—a key improvement for AI agent developers.