GPT-5.5 vs GPT-6.1 Sol

OpenAI's GPT-5.5 against OpenAI's GPT-6.1 Sol — price, context and what each is best at. Both are available through one OpenAI-compatible API.

AnyModel — you pay	GPT-5.5	GPT-6.1 Sol
Vendor	OpenAI	OpenAI
Input / 1M	$0.15	$0.2
Output / 1M	$0.15	$0.2
Context	400K	1M
Best for	Complex coding	Codex CLI

GPT-5.5

OpenAI's flagship for coding, agents and research-grade reasoning.

GPT-5.5 is OpenAI's top general-purpose model and the engine behind modern Codex: state-of-the-art coding, computer use and multi-step reasoning with a 400K-token window on this route. The default pick when you want one model that handles everything.

More about GPT-5.5 →

GPT-6.1 Sol

OpenAI's latest GPT-6 workhorse — near-Astra coding at Sol cost.

GPT-6.1 Sol is the upgrade to GPT-6 Sol, released at OpenAI DevDay 2026: OpenAI's model for complex coding, computer use and professional work, close to GPT-6 Astra on agentic-coding benchmarks at a fifth of Astra's vendor price. Long autonomous sessions, reliable tool calling and reasoning effort up to max. The new default for most Codex work; reach for Astra when the task is unusually hard.

More about GPT-6.1 Sol →

Quick take: pick GPT-5.5 when cost matters most; pick GPT-6.1 Sol when you need the largest context. With AnyModel you don't have to choose up front — switch the model id any time.

FAQ

Which is cheaper, GPT-5.5 or GPT-6.1 Sol?

GPT-5.5 is cheaper on output tokens ($0.15 vs $0.2 per 1M).

Which has a larger context window, GPT-5.5 or GPT-6.1 Sol?

GPT-6.1 Sol has the larger context window (1M).