ChatGPT (GPT-5.6 / Sol)
The All-Round Ecosystem Leader
OpenAI's GPT-5.6 family (public July 9, 2026) replaced GPT-5.5 as the default model, with three tiers: Sol (flagship), Terra (balanced), and Luna (efficient). ChatGPT Work, a new agentic product that handles full jobs (drafts, notes, team context) launched the same day. As of August 6, Sol was consolidated to power both everyday chat and reasoning, replacing the two-model split. Sol API pricing cut 20%+ on August 21. Used by over half of all chatbot users worldwide.
✓Strengths
- •GPT-5.6 Sol/Terra/Luna tiers — Sol is the new flagship frontier model
- •Sol consolidated for everyday chat AND reasoning (Aug 6) — one consistent model replaces the two-model split
- •Sol API price cut 20%+ (Aug 21, 2026) for next 3 months
- •ChatGPT Work: agentic product that runs full jobs autonomously (July 9)
- •GPT-5.6 Luna now free default — unlimited text chats for free users
- •OpenAI o3 retired from ChatGPT August 26; DALL-E GPT retired August 30
- •Best-in-class image generation built in (GPT Image 2)
- •New $8/month Go tier lowers the entry price
- •Massive third-party integration support
⚠Considerations
- •Ads now shown on Free and Go tiers (since Feb 2026)
- •Loses the thread on very long contexts vs Claude/Gemini
- •Confusing multi-tier pricing (Go → Plus → Pro plus API tiers)
- •Pro tiers are expensive ($100-200/month)
Pricing & Details
Pricing
$8/month (Go), $20/month (Plus), $100-200/month (Pro)
Free Option
Yes (GPT-5.6 Luna unlimited text, with usage limits and ads)
Best For
General use, workflow orchestration, multimodal tasks, beginners
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