Claude Sonnet 5 + GPT-5.6 Sol/Terra ── 6 月最終週の dual-track frontier model launch が示す、6/2 EO 30 日後の「cheap agent」競争の構造
本稿は PM 6/30 18:00 HKT 夕方スキャンで 7/1 PM 19:00 HKT 枠に pre-lock した「3 frontier model update 同日発火日 candidates (GPT-5.6 Sol GA + Fable 5 restoration full + Gemini 3.5 Pro July GA = 6/2 EO 30 日 framework final deadline Day-1)」candidate pool の 4th option (Claude Sonnet 5 = Anthropic 6/30 launch) として確定したもの。NONE of the 3 designated frontier updates fired (GPT-5.6 Sol still limited preview 6/27 #92 + Fable 5 partial restoration 6/29 AM #96 + Gemini 3.5 Pro delayed to July per Business Insider 6/24)、but Claude Sonnet 5 launched 6/30 09:00 HKT = the strongest Day-1 fresh frontier model release available = structurally the winning candidate。 ...