Is GLM 5.1 Fast or DeepSeek V4 Flash cheaper?

DeepSeek V4 Flash is cheaper on output tokens ($0.28 vs $8.80 per 1M).

Which has the larger context window, GLM 5.1 Fast or DeepSeek V4 Flash?

DeepSeek V4 Flash has the larger context window (1M tokens).

GLM 5.1 Fast vs DeepSeek V4 Flash

DeepSeek V4 Flash is cheaper on output tokens, while DeepSeek V4 Flash offers a larger context window. Choose GLM 5.1 Fast or DeepSeek V4 Flash based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM 5.1 Fast	DeepSeek V4 Flash
Provider	Fireworks AI	Fireworks AI
Input / 1M tokens	$2.80	$0.14
Output / 1M tokens	$8.80	$0.28
Context window	203K	1M
Parameters	—	284B
Open weights	Yes	Yes
Released	Apr 2026	Apr 2026

GLM 5.1 Fast details →DeepSeek V4 Flash details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.