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Three model releases landed in two weeks in June 2026: Fable 5, open-weight GLM-5.2, and limited-preview GPT-5.6. Skip the leaderboard drama. Here is the builder's take on which model belongs on which workflow step, with every price and benchmark dated and attributed.
Three frontier models landed in June 2026: Claude Fable 5, Z.ai's open-weight GLM-5.2, and OpenAI's limited-preview GPT-5.6. The numbers do not all measure the same thing, so here is an honest, dated comparison on coding score, price, and openness.
Z.ai's GLM-5.2 ships open weights under MIT and reportedly leads the open-weight field on SWE-bench Pro while trading blows with Opus 4.8 on FrontierSWE and MCP-Atlas, at roughly one-sixth of GPT-5.5's blended cost. The catch is a hosted-API data-residency caveat.
