DeepSeek V4.1 Flash hands-on tests and comparisons

A side-by-side video test where DeepSeek cost under half a cent versus a much pricier Sol Ultra, with similar run times, asking viewers who wins.

A user reminds testers to confirm the 1017 tag in DeepSeek Harness, and to update other clients lacking the marker so they don't test an older version.

A video compares DeepSeek-V4.1-Flash-1017 and GPT-6 Luna at max effort on a voxel pelican generation benchmark.

Six notes compare the two cards: Terminal-Bench 4.0 31.2 to 42.3, HLE 36.8 to 42.6, the table cut from 19 to 11 rows, and cost claims backed by a single sentence.

A Polish post says independent benchmarks put the model level with Claude Opus 5 and ahead of GLM-5.3 on logic and coding, and that two DGX Spark workstations can run it locally without sending code out.

Using the same prompt via Seedance 2.5 on Renoise MCP, the post compares DeepSeek-v4.1-flash and Gemini 4 Argon on car fidelity, stunt choreography and HUD detail in a sunset arcade racing clip.

A developer asks whether DeepSeek-V4.1-Flash-1017 works best inside Claude Code, Codex or DeepSeek Harness, seeking hands-on experience.

A user shares a video generated by DeepSeek V4.1 Flash-1017 in Harness, calling the 3D detail and rendering very realistic.

Launch summary: DeepSWE 77.0, Apex Bench 72.1, Agents' Last Exam 35.4, claimed to beat Opus 5 and GPT 5.6-Sol, with DeepSeek Harness and CodeBuddy support.

On the same prompt at max reasoning, Astra was 5x faster with finer detail while DeepSeek cost about one-eighth as much and held up on scene atmosphere.

A roundup of October model rumors that lists V4.1 Flash 1017's architecture and official gains: code repair 74.2%→77.0%, terminal 31.2%→42.3%, agent tasks 54.8%→60.5%.

A Chinese user reports V4.1 Flash 1017 outperforms Kimi K3 and GLM4.3, with strong price and speed, landing close to Gemini 4 Argon on a pelican test.