[aryan5v]

Purpose

Clients currently see only a served alias from /v1/model_info, so an initial five-second 480p serve default can become an accidental permanent UI limit. Publish known MiniMax-H3/FastH3/Omni and Pika H3 Flex output geometry separately from request defaults.

Changes

• Add versioned video_output_capabilities: the 24 fps causal-VAE frame grid, integer durations 5–15 seconds, and recommended 480p/768p canvases across aspect families.
• Reuse family geometry rules; unknown families return null. Explicit MiniMax-H3 recommendations stay within the adapter's canvas area limit after lattice rounding.
• Keep model support separate from device capacity (hardware_capacity_verified: false). This does not change generation, trained sampling schedules, attention, residency, or hardware policies.

Test Plan

• Isolated CPU-only pytest run of fastvideo/tests/entrypoints/test_generation_capabilities.py: 4 passed, covering both families, frame alignment, canvas validity, unknown families and the mounted HTTP route. Used existing Linux dependencies; no model loading or GPU generation.
• pre-commit run --files docs/design/server_contracts/openai.md fastvideo/entrypoints/openai/common_api.py fastvideo/entrypoints/openai/generation_capabilities.py fastvideo/tests/entrypoints/test_generation_capabilities.py: all applicable checks passed, including mypy.

Draft: this is geometry discovery, not evidence that 768p/15-second reference-heavy generations fit any particular GPU. The companion opt-in harness reader is dreamverse-harness #139. No live worker was patched or restarted to validate this change.

[mergify]

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