GPT-5.6 Sol, Terra, and Luna get a public launch date: July 9
OpenAI says GPT-5.6 Sol, Terra, and Luna will launch publicly on July 9, moving the model family beyond its limited partner preview. This short brief explains the three tiers, published pricing, capability claims, and the remaining access caveats.
OpenAI has put a date on GPT-5.6's wider release: Sol, Terra, and Luna are set to launch publicly on Thursday, July 9, after a limited partner preview that began in late June. The company said on X that it is "expanding preview access globally now," a shift from the earlier U.S.-partner-only rollout. 1
What is launching
GPT-5.6 is not a single model name this time. OpenAI is packaging it as a three-tier family:
| Model | Positioning | Published API price |
|---|---|---|
| GPT-5.6 Sol | Flagship model for harder reasoning, coding, science, cybersecurity, and long agentic work | $5 input / $30 output per 1M tokens 2 |
| GPT-5.6 Terra | Balanced everyday model, described as competitive with GPT-5.5 at lower cost | $2.50 input / $15 output per 1M tokens 2 |
| GPT-5.6 Luna | Fast, low-cost option for high-volume work | $1 input / $6 output per 1M tokens 3 |
The naming system matters because OpenAI is trying to separate model generation from capability tier. GPT-5.6 identifies the generation; Sol, Terra, and Luna identify durable tiers that can move at different cadences. 2
What is new
OpenAI says Sol is its strongest model so far, with gains in coding, biology workflows, cybersecurity, and longer-horizon agentic tasks. The company points to Terminal-Bench 2.1 for command-line coding workflows, GeneBench v1 for genomics and quantitative-biology work, and ExploitBench/ExploitGym for controlled cybersecurity evaluations. 2
Two product changes are worth separating from the benchmark claims. First, GPT-5.6 adds a new
max reasoning effort, giving Sol more time to work through difficult tasks. Second, it adds an ultra mode that can use subagents for complex work. 2The limits are just as important. OpenAI says it will publish a broader evaluation suite when GPT-5.6 becomes broadly available, so the current performance picture is still mostly an OpenAI-supplied preview. The company also says Sol did not cross its Cyber Critical threshold in tested conditions, even though it improved on vulnerability research and exploitation-related tasks. 2
Availability caveat
OpenAI's Help Center still describes the preview as limited to selected organizations through the API and Codex, with ChatGPT excluded during that preview phase. 3 The July 8 X post changes the timeline by saying the family will launch publicly on July 9, but it does not spell out whether ChatGPT, Codex, and API users will all receive access at the same time. 1
Khaleej Times, carrying AFP, reported that the wider launch follows U.S. government review activity and cited Axios reporting that the Trump administration had given OpenAI a green light for broader availability. That context helps explain the staged release language, but the product fact to watch is simpler: whether normal developer and ChatGPT accounts actually see Sol, Terra, and Luna appear on July 9. 4
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