OpenAI has launched GPT‑5 and made it free for all ChatGPT users. Unveiled by CEO Sam Altman in a live event, GPT‑5 upgrades core abilities across reasoning, reliability, memory, and real‑world integrations—pushing ChatGPT further toward a true digital assistant.

GPT‑5 emphasizes “agent‑like” reasoning. Instead of merely replying, it interprets context, breaks down complex tasks into parts, and takes structured actions. When the model doesn’t know, it says so—reducing false confidence and cutting hallucinations.

Key upgrades at a glance

• Smarter reasoning and fewer mistakes
  • Breaks complex prompts into manageable steps and responds contextually—often on the first attempt.
  • Hallucination rates: GPT‑5 Thinking 4.8%, GPT‑4o 20.6%, o3 22%.
  • HealthBench hallucinations: 1.6%, with more proactive yet careful behavior on health queries.
• Vibe coding for instant UI prototypes
  • Describe a mood or product feel, and get working HTML/CSS/JS that reflects intent and design logic.
  • SWE‑bench Verified: GPT‑5 at 74.9% (Claude Opus 4.1 at 74.5%; Gemini 2.5 Pro at 59.6%).
• Benchmarks snapshot
  • GPQA Diamond (PhD‑level science): 89.4% vs Claude Opus 4.1 at 80.9%.
  • Humanity’s Last Exam (tools mode): 42% vs xAI Grok 4 Heavy at 44.4%.
  • Slightly behind on some agentic tasks (e.g., airline navigation), but ahead in coding and knowledge.
• Safety and honesty tuned in
  • Better at detecting bad‑faith prompts, avoiding manipulation, and being transparent under uncertainty.

Personalities and upgraded voice

• Choose a style that matches you: Cynic (dry wit), Listener (empathetic), Nerd (fact‑rich), Robot (objective).
• Voice Mode now sounds more natural, adapting tone and pacing on request.
  • Plus subscribers: nearly unlimited voice; Free: a few hours daily.
  • Standard Voice Mode retires in 30 days.
  • Custom GPTs inherit your selected voice settings.

Google integrations for Pro

• Link Gmail, Calendar, and Contacts to let ChatGPT:
  • Draft emails from past threads, schedule meetings, check availability, and surface contacts.
  • Suggest next steps from ongoing conversations without explicit prompts.
  • Access is minimized to only what’s necessary.

Access, pricing, and sizes

• Free users
  • Default access to GPT‑5 with core capabilities (writing, reasoning, coding), personalities, limited Voice Mode, and auto model routing.
• Pro users ($200/month)
  • Unlimited access plus GPT‑5 Pro and GPT‑5 Thinking for deeper, tool‑assisted answers.
  • Google integrations and expanded voice usage.
• Models and API
  • Sizes: gpt‑5 (full), gpt‑5‑mini, gpt‑5‑nano (API only).
  • Free users start on full and overflow to mini after limits.
  • API pricing (example): gpt‑5 at $1.25 per million input tokens and $10 per million output tokens.
  • Developers can control verbosity for concise or detailed responses.

Practical ways to try GPT‑5 today

• Turn a product “vibe” into a live webpage, then iterate via tone and layout prompts.
• Summarize a long email thread and auto‑draft a reply that mirrors your voice.
• Ask for a week’s schedule preferences and let it propose meetings around your constraints.
• Use personalities to adapt delivery—snappy productivity tips with Cynic, gentle coaching with Listener.