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MOTIR-2115

WATCH — DeepSeek V4-Pro official release: re-verify the planner's DEFAULT model (pricing, id, the tool_calls workaround, Responses support) when it ships

To Do
Description

Trigger

DeepSeek publishes the official (non-preview) deepseek-v4-pro. Do not start this card before then — there is nothing to verify until it ships.

Where things stand (verified 2026-08-04)

deepseek-v4-pro is still DeepSeek-V4-Pro-Preview. The 0731 changelog entry is explicit: "This update only upgrades the DeepSeek-V4-Flash API. The DeepSeek-V4-Pro API and the APP/WEB models are unchanged" — closing with "The official release of DeepSeek-V4-Pro will follow soon." No date is committed. Third-party posts claiming "Pro in early August 2026" are not corroborated by DeepSeek's own docs.

Current preview specs, for the diff: 1.6T total / 49B active MoE, 1M context, 384K max output, $0.435 in (cache miss) / $0.003625 in (cache hit) / $0.87 out per MTok.

Why this one is not routine housekeeping

deepseek-v4-pro is motir-ai's default planner model — src/llm/gatewayClient.ts:23, default: 'deepseek-v4-pro'. Every plan Motir generates runs on it. Motir's primary product path is therefore pinned to a preview build today, and the release will change that build under us without an id change (that is exactly what Flash's 0731 did).

What to check, in order

  1. Model id. Flash's official build kept the id deepseek-v4-flash — no code change. Confirm Pro does the same; if it introduces a dated or renamed id, relay/adaptor/deepseek/constants.go and the pin at gatewayClient.ts:23 both move.
  2. Pricing. Re-read api-docs.deepseek.com/quick_start/pricing against relay/billing/ratio/model.go — "deepseek-v4-pro": 0.435 * MILLI_USD (input, cache-miss) and the output multiplier 0.87 / 0.435. These are hand-curated entries that deliberately override the OpenRouter catalog (PR #10); if DeepSeek moves the numbers, the curated entries must move with them, and motir-ai's ModelCreditRate seed (aligned to the gateway catalog by MOTIR-1324) has to be re-checked in the same pass or the ledger silently drifts.
  3. The tool_calls reliability workaround. gatewayClient.ts:251 documents a V4-Pro caveat: the model lands tool-calls in non-thinking mode and can emit a reasoning-only turn with no tool_calls field (deepseek-ai/DeepSeek-V3#1244), and the planner loop reads around it. Flash's 0731 build was re-post-trained specifically for agentic/tool-calling behaviour. If Pro gets the same treatment, re-test this caveat — the workaround may be removable. Removing dead defensive code is the point; keeping it after the underlying bug is fixed makes the loop harder to reason about forever.
  4. Responses API + Codex adaptation. Flash's official build added both. If Pro's does too, say so on MOTIR-2114 — it changes that decision's inputs (today Pro cannot be the first Responses consumer because it does not speak it).
  5. Benchmarks vs Flash. The 0731 Flash build already beat V4-Pro-Preview on agent benchmarks (Terminal Bench 2.1: 82.7 vs 72.1). If official Pro does not clearly reclaim the lead for planning-shaped work, the "Pro is the default, Flash is the cheap lane" split in gatewayClient.ts:23-24 deserves a fresh look — Flash is ~3× cheaper on input and ~3× on output.

Deliverable

A short written verdict on this card: what changed, what did not, and which follow-on cards are needed. Any code consequence is a separate card per repo (one subtask = one repo = one PR) — this card verifies and reports, it does not ship the change. Expected follow-ups, if triggered: a motir-gateway pricing/id card, a motir-ai workaround-removal card, and possibly a model-choice decision.

Acceptance criteria

  • The verdict names the exact DeepSeek changelog entry (date + build identifier) it is based on — not a third-party summary.
  • Gateway pricing is either confirmed unchanged against the live pricing page, or a follow-up card exists with the new numbers.
  • The gatewayClient.ts:251 caveat is either re-confirmed as still necessary (with the observation that showed it), or a removal card exists.
  • MOTIR-2114 is updated with Pro's Responses status either way.
  • If nothing needs changing, that is recorded explicitly and the card is closed — a "no action" result is a valid, useful outcome, not a reason to leave it open.

Raised 2026-08-04 from the V4-Flash 0731 release check, which found the gateway already correct for Flash but the Pro release still pending.