Chatbots · Head-to-head

GPT-5.6 Sol vs Siri AI

GPT-5.6 Sol (paid, AI Score 9.3/10) vs Siri AI (free, AI Score 8/10). Side-by-side pricing, features, pros and cons, and which to pick.

The verdict

Pick GPT-5.6 Sol if…

→overall capability matters more than price (AI Score 9.3 vs 8)
→you want our editor's pick for this category
→your primary use case is engineering teams building long-horizon coding or tool-use agents who need a frontier reasoning tier for the hard steps and can route easier calls to terra or luna on the same api key.
→you need: development, research

Try GPT-5.6 Sol →

Pick Siri AI if…

→budget is the constraint
→your primary use case is apple device owners who want an assistant that acts on their own messages, mail, calendar and photos across apps without uploading that data to a third-party cloud or paying a subscription.
→you need: productivity

Try Siri AI →

Spec	GPT-5.6 Sol	Siri AI
Category	Chatbots	Chatbots
Pricing model	paid	free
Headline pricing	API usage-based: Sol $5/$30 per 1M tokens; cheaper Terra and Luna tiers cut July 30	Free with iOS 27 / macOS 27 — no subscription tier announced
Free tier	No free API tier for Sol. Free and Go ChatGPT accounts default to the cheaper Luna tier instead, with a Think button and unlimited text chats.	Everything is the free tier — Apple has not announced a paid Siri or Apple Intelligence subscription. Costs that do appear are adjacent: iCloud+ storage, and any third-party model subscription you choose to link. Confirm on apple.com/apple-intelligence before quoting.
AI Score	9.3/10	8/10
Best for	Engineering teams building long-horizon coding or tool-use agents who need a frontier reasoning tier for the hard steps and can route easier calls to Terra or Luna on the same API key.	Apple device owners who want an assistant that acts on their own messages, mail, calendar and photos across apps without uploading that data to a third-party cloud or paying a subscription.
Editor's pick	✓ Yes	—
Use cases	development agents research	productivity agents
Date added	2026-06-27	2026-06-10

Chatbots · paid

✓Generally available since July 9, 2026 — no waitlist or government-coordination gate, so it can carry production traffic
✓Same-family routing by difficulty: Sol for hard problems, Terra and Luna for everything else on one API key
✓Reasoning effort is an explicit control, both as an API parameter and as a consumer slider in ChatGPT Plus and Pro
✓Cerebras-backed serving with a quoted ~750 tokens/sec, which matters for agent loops and streaming code output
✓Now the model answering paid ChatGPT conversations, with OpenAI reporting 68% fewer factual errors on its high-stakes evals

×Sol's $5/$30 has not moved since launch while Terra and Luna were cut 20% and 80% — the tier long agent runs bill against is the one not getting cheaper
×Every headline number (Terminal-Bench SOTA, 68% factuality, ~750 tokens/sec) is OpenAI-measured on undisclosed evaluation sets, with no independent re-run published
×Named in the August 2026 third-party cyber evaluations, where models with safeguards removed pursued real people and organisations — a dual-use profile worth reviewing before security-sensitive use
×Open-weights rivals now score competitively on agentic benchmarks at a fraction of the price, narrowing Sol's case for mid-difficulty work

Chatbots · free

✓Personal context across Messages, Mail, Calendar, Photos and Files that no cloud-first assistant can match without you uploading the same data
✓Free with the OS, on roughly a billion active devices — zero friction, no subscription, no separate app to adopt
✓Private Cloud Compute is a real architectural distinction, not a policy promise: attestable enclaves, no retention, independently inspectable server images
✓Onscreen awareness and App Intents make it an OS-level actor rather than a chat window you copy-paste out of
✓Developers can call the on-device foundation model free of per-token cost through the Foundation Models framework

×Reasoning depth trails ChatGPT, Claude and Gemini badly — hard analytical and long-form work still gets handed off to a third-party model
×Apple's delivery record on this specific feature is the category's worst: demoed June 2024, withdrawn March 2025, shipped 2026
×Locked to Apple hardware — no Android, no Windows, no web client, and older devices without Apple Intelligence support are excluded outright
×Third-party app control is only as good as each developer's App Intents adoption, so agentic coverage is patchy outside Apple's own apps

Updated 2026-08-10. Spec data sourced from official product pages and tracked in our public directory at /tools.