GPT-5.6 officially released: Leads Claude Fable model by 13.1 points in Agent evaluation.

CoinWorld news, OpenAI has released the GPT-5.6 series, including the flagship model SOL, the balanced version Terra, and the low-cost version Luna. The new models are now available on ChatGPT, Codex, and the API. GPT-5.6 SOL focuses on performance and efficiency. In professional Agent evaluations, SOL scored 53.6, 13.1 points higher than Claude Fable 5. With medium reasoning intensity, SOL still leads by 11.4 points, with an estimated cost of about one-quarter of the competitor. Programming capabilities have also improved; SOL scored 80 points on the programming Agent index, 2.8 points higher than Fable 5, while outputting less than half the tokens, taking less than half the time, and costing about one-third less. GPT-5.6 also introduces the Ultra mode, which by default runs 4 Agents in parallel, using more tokens for stronger results and shorter time. API users can also call the multi-Agent beta. The API prices per 1 million tokens for input and output are: SOL $5 and $30, Terra $2.5 and $15, Luna $1 and $6.
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MemeTide
· 59m ago
Winning with moderate reasoning intensity shows that the architecture is well optimized, not just a matter of piling on computing power.
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GateUser-6bc62511
· 1h ago
The balanced version of Terra feels like it will be the choice of most people. SOL is too expensive, Luna is too weak.
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RecedingTideReflection
· 1h ago
53.6 to 40.5 — the gap is bigger than I thought. Have the evaluation criteria changed?
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FiveMinutesBeforeLiquidation
· 1h ago
Cost reduced to one quarter, still leading by 11 points — Claude is under immense pressure.
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RugcheckRoommate
· 1h ago
OpenAI’s latest naming is quite interesting—SOL, Terra Luna—the crypto community’s DNA is activated.
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