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GPT-5.6 Terra is the balanced middle tier of OpenAI's Sol/Terra/Luna family, at $2.50/$15 per 1M tokens. What it does, how it compares, and where it fits.

What GPT-5.6 Sol actually is: the flagship of OpenAI's Sol/Terra/Luna family, how its new max and ultra modes work, what it costs at $5/$30 per 1M tokens, and where it fits for support.

GPT-5.6 Sol Ultra is OpenAI's multi-agent mode that tops Terminal-Bench 2.1 at 91.9%. How it works, the token-cost catch, and when it is actually worth turning on.

GPT-5.6 Sol is OpenAI's flagship tier at $5/$30 per 1M tokens. Here is the full pricing, how it compares to GPT-5.5, the hidden costs, and where you can use it.

My GPT-5.6 Sol review: how OpenAI's flagship tier holds up on agentic coding, what it costs at $5/$30 per 1M tokens, the safety catch in its system card, and who should actually wait.

Claude Code runs free to $200+/month by plan, but Anthropic's own data puts real team spend at $150-250 per developer. Here's the full breakdown.