GPT-5: Everything Developers Need to Know
OpenAI's GPT-5 is here. We break down the new capabilities, benchmark results, API changes, and what it means for AI-powered development workflows.
GPT-5 represents a massive leap in AI capability. With improved reasoning, native tool use, and a 1M token context window, it changes the game for developers.
Key Improvements
The model brings significant advances in code generation accuracy, multi-step reasoning, and instruction following. Benchmarks show a 40% improvement over GPT-4o on complex coding tasks.
API Changes
The API now supports streaming tool calls, structured outputs with guaranteed schema compliance, and native image generation. The new `/v1/responses` endpoint replaces the old completions API.
What This Means for Developers
With GPT-5, many tasks that previously required fine-tuning now work out of the box. The improved function calling makes building AI agents significantly more reliable.
Pricing
Input tokens are $2.50/1M and output tokens are $10/1M -- roughly 50% cheaper than GPT-4o for equivalent quality. The mini version is even more affordable at $0.40/1M input.