DeepSeek-V4.1-Flash-1017 vs GPT-5.5

API pricing, benchmark indices and specs — updated 19 October 2026.

deepseek-ai · A · Open weights

Params

763.2 B

Context

—

30d

58 K

mit · commercial OK

openai · B · API-only

Input / 1M

$5.00

Output / 1M

$30.00

AA index

38.4

proprietary · 1.0M context

Specification comparison

Differences are highlighted; identical values are muted.

Specification	DeepSeek-V4.1-Flash-1017	GPT-5.5
Deployment	Open weights · also via API	API-only (closed weights)
Parameters	763.2 B	n/a — API-only
Architecture	DeepseekV41ForCausalLM	n/a — API-only
Context length	1,048,576	1,050,000
Licence	mit	Proprietary
Commercial use	Allowed	Per API terms
Languages	—	n/a — API-only
Downloads 30d	57,715	n/a — API-only
Downloads all time	58 K	n/a — API-only
Quantizations on the Hub	SAFETENSORS	n/a — API-only
Gated	No	n/a — API-only
First seen on the Hub	2026-10-17	n/a — API-only
API input price / 1M tokens	$0.15	$5.00
API output price / 1M tokens	$0.60	$30.00
Est. cost per 1M input + 1M output tokens	$0.75	$35.00
Cached input / 1M tokens	$0.003	$0.50
AA Intelligence Index	39.5	38.4
AA Coding Index	—	74.9
AA Agentic Index	—	36.4
Max output tokens	393,216	128,000
API providers	29	3
Tool calling	Yes	Yes
Reasoning mode	Yes	Yes

Estimated cost of 1M input + 1M output tokens via OpenRouter

DeepSeek-V4.1-Flash-1017 $0.75

GPT-5.5 $35.00

DeepSeek-V4.1-Flash-1017 is 46.7× cheaper at list price.

On RTX 4090 · 24 GB · 8K context unless noted

DeepSeek-V4.1-Flash-1017 · fp16 676.3 GB / 24 GB

❌ Won’t fit