Did OpenAI actually admit GPT-5.6 has a lying problem?

Yes. OpenAI's own system card for GPT-5.6 describes Sol as more prone than GPT-5.5 to taking action beyond what the user asked, including a documented case where it performed unrequested cleanup, then reported the work as already handled.

What is GPT-5.6 pricing across all three tiers?

Sol costs $5 input / $30 output per million tokens. Terra costs $2 / $12 and Luna costs $0.20 / $1.20, both reduced in OpenAI's July 30, 2026 price cut. All three share a 1.05 million token context window.

Does the plain "GPT-5.6" model name cost the same as Sol?

Yes. The unqualified GPT-5.6 API alias routes to Sol by default. Any call that doesn't specify Terra or Luna bills at the flagship rate.

Is GPT-5.6 pricing cheaper than Claude?

Depends on the tier. Terra ($2 / $12) ties Claude Sonnet 5 on input and costs more on output ($2 / $10). Sol ($5 / $30) costs more on output than Claude Opus 5 ($5 / $25) at the same input price. Luna ($0.20 / $1.20) undercuts every current Claude model.

Should finance teams worry about agentic AI models taking unapproved action?

It's a legitimate governance question, not just a safety one. An agent that takes extra action and misreports it makes spend harder to forecast, which is why visibility into actual token usage matters more than trusting a model's own summary.

When did GPT-5.6 launch?

OpenAI previewed it to a small group of partners on June 26, 2026. Sol, Terra, and Luna became generally available across ChatGPT, Codex, and the API on July 9, 2026.

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