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1. Best-in-Class Coding & Collaboration

OpenAI presents GPT‑5 through its API as the most advanced model yet for coding and agentic tasks. It leads flagship benchmarks:

  • 74.9% on SWE‑bench Verified
  • 88% on Aider Polyglot

What makes it standout:

  • Excels at tasks like bug fixing, code editing, and comprehending large codebases
  • Produces front-end UI code with high aesthetic quality, preferred over previous model “o3” 70% of the time
  • Developers reported GPT‑5 is “smartest coding model they’ve used“—easy to steer, with a distinct personality

2. Powerful Agentic Performance

GPT‑5 establishes new records on agent-centric benchmarks:

  • 96.7% on τ²‑bench telecom
  • 69.6% on Scale MultiChallenge (instruction following)

It demonstrates reliable tool chaining, error handling, and long-context retrieval. On the BrowseComp Long Context benchmark (128–256K tokens), it answers correctly 89% of the timeOpenAI

3. More Flyweight, More Flexible

Developers gain new tools to tailor responses:

  • verbosity: choose between low, medium, or high output length
  • reasoning_effort: options of minimal, medium, or high for speed vs. depthOpenAI
  • minimal reasoning reduces latency with prioritized quick responsesOpenAI

4. Enhanced Tool Ecosystem

GPT‑5 API introduces richer interaction capabilities:

  • Preamble messages before and during tool actions to provide progress feedback
  • Support for custom tools accepting plaintext (not just JSON) and allowing developer-defined grammars
  • Improved tool reliability, handling errors and workflows more gracefullyOpenAI

5. Massive Context Capacity & Trust

The model supports up to 400K token context (272K input + 128K output), enabling extremely long sessions or documents
It also offers fewer factual errors (~80% reduction vs. o3) on benchmarks like LongFact and FactScore. This makes it especially suited for use cases that need precision, like coding or enterprise environments

6. Safety & Availability

GPT‑5 is OpenAI’s safest, most reliable model to date—less prone to hallucinations, more transparent in its limitations, and highly aligned with safety standards
Available now across APIs:

  • gpt-5, gpt‑5‑mini, gpt‑5‑nano
  • Accessible via Responses API, Chat Completions API, and Codex CLI
  • Fully supports prompt caching, streaming, structured outputs, batch API, and built-in tools like search and image generation
    Also integrated deeply into Microsoft’s ecosystem, including GitHub Copilot, Azure AI Foundry, and Microsoft 365 Copilot, with enterprise-grade safety and compliance

Final Take

GPT-5 for Developers delivers on multiple fronts:

  • Superior coding intelligence that surpasses previous API models
  • Agentic task mastery, chaining tools with finesse
  • Precise developer controls via verbosity and reasoning settings
  • Massive context support and strong factuality
  • Rock-solid safety and enterprise availability

This release marks a new era for developers and organizations—where building complex, long-running, and trustworthy AI solutions becomes both practical and powerful. If you’d like, I can help craft sample prompts or tool integrations to make the most of GPT-5’s developer features.