docs: update models for GLM 5.3 support

[tembo]

What changed

Added GLM 5.3 (glm-5p3) and GLM 5.3 Flash (glm-5p3-flash) to the Supported Models table in features/models.mdx, and added both to the Opencode and Pi harness model lists in features/agents.mdx.

Why

The monorepo added these two models to the production model registry, litellm config, pricing table, and the Opencode/Pi harness allow-lists, but the docs' Supported Models table and per-harness model lists still only listed GLM 5.2.

Evidence

• monorepo PR #10871 "feat(models): add Fireworks GLM 5.3 models" (commit c8f744a), which added:
  • apps/api/src/server/models/index.ts: glm-5p3 → label "GLM 5.3", glm-5p3-flash → label "GLM 5.3 Flash" (provider zai, hostProvider fireworks_ai, requiresApiKey: false, freePlanEligible: true)
  • apps/litellm/litellm-config.json: routing entries for both models
  • apps/api/src/services/tokenUsage.ts: pricing entries for fireworks_ai/glm-5p3
  • packages/agent-runtime/src/runtime/harness/{fx,opencode,pi}/definition.ts: added both models to the Opencode and Pi harness allow-lists
  • Tests: apps/api/tests/models.test.ts, apps/api/tests/piModelsConfig.test.ts
• Both models are treated identically to the existing GLM 5.2 (No BYOK required, free-plan eligible, no internal-only flag), matching the existing docs convention for that row.

Confidence

High-confidence: this is an exact addition of two production model IDs/labels to an existing, actively-maintained reference table and harness list, directly supported by the merged implementation and test assertions. No wording, positioning, or restructuring judgment calls were needed — the new rows follow the exact format of the adjacent GLM 5.2 row.

cc @benja

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Note

Low Risk
Documentation-only updates to model reference tables with no runtime or security impact.

Overview
Documents GLM 5.3 and GLM 5.3 Flash so public model references match the production registry and Opencode/Pi harness allow-lists.

features/models.mdx adds two Supported Models rows (glm-5p3, glm-5p3-flash, provider Z.ai, BYOK not required), using the same pattern as GLM 5.2. features/agents.mdx appends both names to the Models lists under the Opencode and Pi harness sections only; other harness accordions are unchanged.

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[tembo]

Requesting review from @DarrenBaldwin07 who has experience with the following files modified in this PR:

• features/models.mdx

[tembo]

The model names, IDs, provider, BYOK status, and current OpenCode/Pi mappings match monorepo PR #10871. However, this is blocked by the release requirement.

• Product PR #10871 merged as c8f744a on August 30, after the latest published release v0.2.828 from August 26.
• The commit is contained in draft v0.2.829, but that release is not published and has no successful production release deployment yet. Passing PR CI and preview deployments are not production-release evidence.

Before this merges after the release, please also complete the related docs:

• Add glm-5p3 and glm-5p3-flash rows to resources/pricing.mdx; #10871 added explicit metering prices, while the pricing table currently stops at glm-5p2.
• #10871 enables both models for FX as well as OpenCode and Pi. Coordinate with open docs PR docs: update agent harnesses for fx support #719: after its FX accordion lands, the FX model list also needs these two entries.

Recommendation: keep #727 blocked until a published release containing c8f744a completes production deployment, then rebase, add the missing pricing/FX coverage, re-verify, and merge.