DeepSeek V4.1 Flash 1017 Ultrafast is now available on AI Gateway through Fireworks. This model can generate upwards of 1,000 tokens per second.
Ultrafast serves the October 17 update of DeepSeek V4.1 Flash through Fireworks' accelerated serverless endpoint. It is suited to interactive coding, reasoning, and agentic workflows where applications need to generate output and move to the next step quickly.
The model has a 1M-token context window for working with large codebases and long inputs. It is available in public preview without a waitroom or session time limit.
Use it by setting deepseek/deepseek-v4.1-flash-1017-ultrafast as the model name:
To use it in Claude Code, Codex, Cursor, and more, install the latest Vercel CLI and run setup:
Then select `deepseek/deepseek-v4.1-flash-1017-ultrafast` in the agent. See the [coding agents guide](https://vercel.com/docs/ai-gateway/coding-agents) for details.
Try DeepSeek V4.1 Flash 1017 Ultrafast in the [model playground](https://vercel.com/ai-gateway/models/deepseek-v4.1-flash-1017-ultrafast).
AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime. It includes built-in custom reporting, Zero Data Retention support, budgets for API keys, routing rules, and more.
AI Gateway reflects provider pricing with no markup and does not charge a platform fee on inference, including on Bring Your Own Key (BYOK) requests.
You can view all language models available on AI Gateway.