DeepSeek V4 Flash Base vs GLM 5.1

This comparison does not currently contain a protocol-matched coding benchmark for both DeepSeek V4 Flash Base and GLM 5.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.

Only GLM 5.1 has a directly sourced input price: $1.05 per million tokens. Only GLM 5.1 has a directly sourced output price: $3.50 per million tokens.

DeepSeek V4 Flash Base has the larger sourced context window. DeepSeek V4 Flash Base supports 1,049K and GLM 5.1 supports 203K.

There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.

Both models have the same recorded self-hosting status: supported. DeepSeek V4 Flash Base is open weight; GLM 5.1 is open weight.

DeepSeek V4 Flash Base is not documented with image input; GLM 5.1 is not documented with image input. This reflects supported input modalities, not vision quality.

Neither has a larger sourced maximum output. DeepSeek V4 Flash Base is — and GLM 5.1 is —.

DeepSeek V4 Flash Base: none of these features are definitively sourced. GLM 5.1: reasoning and tool calling. Feature support does not establish relative quality.

DeepSeek V4 Flash Base has 0 sourced provider routes; GLM 5.1 has 4, so GLM 5.1 has broader tracked availability.

There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.