Compare DeepSeek V4 Flash 0731 Fast from DeepSeek and GLM 5.1 from Z.AI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.
DeepSeek V4 Flash 0731 Fast
GLM 5.1DeepSeek V4 Flash 0731 Fast is a high-speed deployment of DeepSeek’s agentic model provided by Wafer, designed for coding, tool use, and high-volume agent workloads. It preserves the capabilities of V4 Flash 0731 while delivering much faster inference. Compared with V4 Pro, it prioritizes latency and execution efficiency.
GLM-5.1 is Zhipu's latest flagship model, with greatly enhanced coding capabilities and significantly improved long-range task performance. It can continuously and autonomously work for up to 8 hours on a single task, completing the full closed loop from planning and execution to iterative optimization, delivering engineering-grade results. In terms of general capability and coding ability, GLM-5.1's overall performance aligns with Claude Opus 4.6, and it demonstrates stronger sustained work capability in long-range autonomous execution, complex engineering optimization, and real-world development scenarios, making it an ideal foundation for building Autonomous Agents and long-horizon Coding Agents.
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Promotional prices show the discounted rate; see each model page for promotion windows.
Daily traffic served through AIHubMix — how demand for each model is trending.
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.
Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.
Estimate your monthly bill for the same workload on each model.
Monthly = daily × 30. Discounted rates applied where a promotion is active.
DeepSeek V4 Flash 0731 Fast: $1.4/M output tokens; GLM 5.1: $3.38/M. Use the cost calculator above to estimate your own workload.
GLM 5.1: 1514; DeepSeek V4 Flash 0731 Fast: 1483 (LMArena coding leaderboard).
DeepSeek V4 Flash 0731 Fast: 0.5s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
DeepSeek V4 Flash 0731 Fast accepts 1,000,000 and GLM 5.1 accepts 200,000 input tokens. Maximum output per request is 384,000 tokens on DeepSeek V4 Flash 0731 Fast and 131,072 tokens on GLM 5.1.
DeepSeek V4 Flash 0731 Fast at 94.9 tok/s and GLM 5.1 at 22.0 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.
DeepSeek V4 Flash 0731 Fast accepts text input and supports tool calling, function calling, structured outputs and thinking; GLM 5.1 accepts text input and supports thinking, tool calling, function calling and structured outputs.
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