GPT-5.4 - Designed for Professional Work

GPT-5.4 is OpenAI's current flagship. One architecture that rolls coding, reasoning, and long-context handling into a single model. On Softgen that means sharper code, better UI, and better judgment across long sessions.

Why Choose GPT-5.4 for Your Agent?

Your agent gets measurably stronger on the things that matter for building web apps:

• 57.7% on SWE-Bench Pro — strong real-world software engineering (up from 55.6% on GPT-5.2)
• 75.1% on Terminal-Bench 2.0 — reliable execution of multi-step terminal workflows
• 83.0% on GDPval — top-tier professional knowledge work quality (up from 70.9%)
• 1M-token context window — holds more of your project in view at once for cross-file reasoning and large refactors
• 33% fewer false claims and 18% fewer errors in full responses vs. GPT-5.2

Real Developer Experiences:

"GPT-5.4 is the best model we've ever tried... top of our APEX-Agents benchmark." - Brendan Foody, CEO, Mercor

"GPT-5.4 is currently the leader... more natural and assertive than previous models." - Lee Robinson, VP Developer Education, Cursor

What Your Agent Delivers

• Sharper code generation: 57.7% SWE-Bench Pro and 75.1% Terminal-Bench 2.0 translate to fewer broken builds and fewer retries inside your project
• Better long-context project handling: the 1M-token window keeps more of your codebase in scope, so cross-file refactors and large migrations stay coherent (272K standard; requests beyond that count at 2× usage)
• More reliable tool calling: 98.9% on Tau2-bench Telecom — fewer malformed edits and fewer wasted iterations through file, terminal, and database tools
• Enhanced front-end work: stronger UI construction and visual understanding when you paste screenshots or describe layouts in detail
• Fewer hallucinations: 33% fewer false individual claims and 18% fewer errors in full responses vs. GPT-5.2 — less time spent correcting the agent

Cost

Official Rates:

• Input: $2.50 per 1M tokens
• Cached input: $0.25 per 1M tokens
• Output: $15 per 1M tokens

Typical costs: ~$0.30 for a landing page, ~$1.10 for a small app, ~$2.80 for a complex build. Per-token cost is similar to GPT-5.1 on input, but overall sessions often come out cheaper because GPT-5.4 needs fewer correction loops and handles more of your project in a single pass.

Building Web Apps with GPT-5.4 on Softgen

GPT-5.4 is OpenAI's pick when the session runs long and the codebase is complex. The 1M context window (272K standard, 2× beyond) holds multi-file projects in view. Reliable tool calling means fewer broken actions and fewer correction loops through file, terminal, and database tools.

Worth the cost when fewer retries beat cheaper tokens.

When to Use a Different Model

• Simple CRUD or template-based projects (try GPT-5)
• Speed-sensitive one-off tasks (try GPT-5 or Claude Haiku 4.5)
• Budget-constrained prototypes (try GPT-5.2 or GPT-5.1)
• Best overall coding and reasoning (try Claude Opus 4.7)

The Bottom Line

GPT-5.4 is the model to reach for when your project has gotten big, complex, or demands professional-grade code quality. It sets new state-of-the-art benchmarks across coding and knowledge work, holds more of your codebase in context, and makes fewer mistakes along the way.

Best for: Complex web apps, large multi-file projects, long-context refactors, agentic tool workflows inside Softgen, and when code quality matters more than session cost.

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Want to learn more? Read the official GPT-5.4 announcement from OpenAI for comprehensive benchmarks and technical details.