GPT-5 by OpenAI: Full Overview of Features, Pricing & Availability

TL;DR:

GPT-5

is OpenAI’s new flagship system that combines a fast main mode and a deep reasoning mode, orchestrated by a smart router. Major upgrades include improved accuracy, better coding, stronger multimodal understanding, and new safety protocols. Available in ChatGPT and via API.

What Is GPT-5?

GPT-5 is a unified system with a fast default mode and a deeper reasoning mode (GPT-5 thinking) connected by an online router that decides how much “thinking” a task needs. If you hit usage limits, it can switch to mini variants seamlessly.

Key Improvements

• Fewer hallucinations, less agreement bias. More faithful instruction following and transparency about limits.

• Coding & frontend. Stronger UI generation, large-repo debugging, and durable multi-tool chains.

• Multimodal. Better at images, charts, screenshots, spatial tasks, and vision-based reasoning.

• Health reasoning. Higher accuracy on HealthBench (not a medical substitute).

• Safety.Safe-completions focuses on helpful, safe outputs over hard refusals.

Benchmarks & Performance

• Math: AIME 2025 (no tools) — 94.6%

• Coding: SWE-bench Verified — 74.9%; Aider Polyglot — 88%

• Multimodal: MMMU — 84.2%

• Health: HealthBench (Hard) — 46.2%

These gains are documented in the GPT-5 System Card and translate into more accurate, useful answers in day-to-day work.

Access & Availability

• ChatGPT: GPT-5 is the new default. Plus has higher limits; Pro includes GPT-5 Pro (deep reasoning).

• Teams / Enterprise / Edu: Team available now; Enterprise & Edu roll out within a week.

• API models:gpt-5, gpt-5-mini, gpt-5-nano, plus gpt-5-chat-latest (chat-optimized).

API Pricing & Context Window

• Context window: up to 400K tokens (~272K input + 128K output).

• Latest pricing: OpenAI Pricing

Why GPT-5 Matters for Skyalo (Global eSIM)

• Multilingual support 24/7. Real-time eSIM help in 18+ languages.

• SEO content & localization. Country-level FAQs, landing pages, and blog posts for 200+ countries.

• Smart support flows. ICCID checks, activation status, APN instructions, and edge-case troubleshooting.

• Recommendation engine. Suggest best eSIM plan by country, trip length, and data needs.

• Safer replies. Fewer hallucinations and safer guidance for telecom-critical scenarios.

Explore Skyalo: global eSIM for travelers

FAQ

What is GPT-5?

A flagship AI model by OpenAI that blends fast responses with deep reasoning via a smart router. It improves accuracy, coding, and multimodal understanding.

How much does GPT-5 cost in the API?

From 1.25/1M (gpt-5); output up to $10/1M tokens.

Is GPT-5 free in ChatGPT?

Rolling out gradually. Free users have access with lower limits; Pro includes GPT-5 Pro.

How is GPT-5 different from GPT-4o or o3?It succeeds both lines: gpt-5-main follows GPT-4o, gpt-5-thinking follows o3, adding routing and safe-completions.

Sources

1. OpenAI Blog — GPT-5 launch

2. GPT-5 System Card (architecture & safety)

3. Safe-completions research

4. OpenAI API Pricing

5. Skyalo — global eSIM app