DeepSeek V4.1 Flash hands-on tests and comparisons

After Cursor shipped its Agent SDK, the author compares coding agent results: Opus 5.5 leads at 61.7 but costs $11.42 per task, while a DeepSeek V4.1 Flash setup costs just $0.39.

A Claude Code workflow uses Opus 5.5 as orchestrator and DeepSeek V4.1 Flash sub-agents running 24 in parallel on Vercel Sandbox, with the author claiming ~99% of work done by DeepSeek for about $9 (unverified).

Hands-on: Opus 5.5 orchestrates while deepseek-v4.1-flash-1017 runs sub-agents in Claude Code; 24 parallel sub-agents cost roughly $9 on DeepSeek, which did 99% of the work.

A user ran V4.1 Flash in Claude Code with rust-skills, reporting fast, cheap, clean Rust output and stable tool calling through long loops.

The author advises switching to the official API, tightening task specs, suspecting third-party serving issues, and keeping Claude as fallback, saying 1017 still works for most tasks.

Cursor's announcement puts DeepSeek V4.1 Flash at $0.60–$0.98 per task across all CursorBench effort levels with the best score in that price band; the poster suggests starting with light PR review and test generation.

A user says DeepSeek V4.1 Flash is now in Cursor, with CursorBench showing $0.60–0.98 per task across reasoning levels, but third-party models bill at API rates, raising doubts about the new subscription's value.

A roundup of a small survey comparing DeepSeek V4.1 Flash coding experience in Codex, Claude Code, Pi and the official DSH harness, arguing the harness shapes prompt, context compaction and tool use.

Cursor now lists V4.1 Flash, with CursorBench putting per-task cost at $0.60–0.98; the author finds it pricier than direct API but good for cheap grunt work.

The author compares GPT-6.1 Terra, Claude Sonnet 5.5, Haiku 5.5 and DeepSeek V4.1 Flash on price, intelligence and speed, finding V4.1 Flash cheapest and GPT-6.1 Terra at only 141 tok/s even with fast mode.

Per a Cursor chart, DeepSeek V4.1 Flash's API price-performance sits roughly between Haiku extra high and Sonnet high, though subscription discounts change the picture.

The open-source huashu-motion project lets Claude Code build launch films with auto-scored music; the author says a 22-second film on DeepSeek V4.1 Flash cost just $0.27.