Launch & Availability
OpenAI officially released GPT‑5 on August 7, 2025, making it available to all 700 million ChatGPT users, including those on the free tier. Microsoft rolled it out simultaneously across its ecosystem—from Copilot to Azure AI Foundry—with a “smart mode” that dynamically routes requests to either fast or deep‑reasoning models.
Performance & Technical Advances
GPT‑5 sets new records in both coding and agentic tasks
It achieves 74.9% on SWE‑Bench Verified and 88% on Aider Polyglot—top marks among OpenAI models.
It demonstrates exceptional ability in tool chaining, scoring 96.7% on τ²‑bench telecom, enabling reliable, multi-step workflows.
Context capacity has massively expanded: up to 272K input tokens, 128K reasoning/output tokens, totaling 400K tokens.
Factuality improved dramatically—~80% fewer errors on benchmarks like LongFact and FactScore.
Developer Control & Flexibility
GPT‑5 supports rich API features:
Verbosity control (
low,medium,high)Reasoning effort parameter to fine-tune speed vs depth
Custom tools interface enables flexible tool integration
It’s also offered in three sizes—gpt‑5, gpt‑5‑mini, gpt‑5‑nano—with tiered pricing:
gpt‑5: ~$1.25 per 1M input tokens, $10 per 1M output tokens
mini: $0.25 / $2
nano: $0.05 / $0.40
Enterprise & Microsoft Integration
Microsoft’s rollout enables Copilot to “think on the fly,” switching between rapid and deep reasoning models based on complexity. GPT‑5 now powers Microsoft 365 Copilot, custom agents via Copilot Studio, GitHub Copilot, and Azure tools.
Thoughts
GPT-5 is a monumental technical advancement for OpenAI, pushing boundaries in reasoning, coding, context handling, and enterprise utility. It blends power with precision and brings AI closer to practical, real-world workflows. Yet, amid the hype, early reviewers highlight that innovation doesn’t always guarantee across-the-board superiority. For businesses and developers, GPT-5 offers transformative capabilities, but discerning users should still watch the nuances.