Intelligence
n/a
GPT-5.5 Pro
wins
40.3
DeepSeek V4 Flash
GPT-5.5 Pro vs DeepSeek V4 Flash
GPT-5.5 Pro from OpenAI and DeepSeek V4 Flash from DeepSeek are shown side by side so you can compare pricing, model IDs, context and output limits, modalities, tool use, release details, and benchmark results where data is available.
GPT-5.5 ProOpenAI
DeepSeek V4 FlashDeepSeek
Basic Information
Name
GPT-5.5 ProGPT-5.5 Pro
Model id
GPT-5.5 Progpt-5.5-pro
Intro
GPT-5.5 ProGPT-5.5 Pro is the higher-compute variant of OpenAI’s GPT-5.5 generation, intended for the hardest professional tasks where answer quality matters more than speed. OpenAI materials describe the Pro tier as thinking harder for greater precision across coding, research, data analysis, and document-heavy work. It should be positioned for difficult reasoning and professional-grade deliverables rather than routine chat.
Author
GPT-5.5 ProOpenAI
Released date
GPT-5.5 Pro2026-04-23
Name
DeepSeek V4 FlashDeepSeek V4 Flash
Model id
DeepSeek V4 Flashdeepseek-v4-flash
Intro
DeepSeek V4 FlashDeepSeek V4 Flash keeps the V4 family’s 1M-token context window but uses a lighter MoE configuration, commonly described as 284B total parameters with 13B activated parameters. The emphasis is throughput: fast inference, lower cost per call, and production workloads that still need long-context handling. It is the better fit when the task volume is high and the workload benefits from V4-style long-context architecture without always requiring the deepest reasoning tier.
Author
DeepSeek V4 FlashDeepSeek
Released date
DeepSeek V4 Flash2026-04-24
Pricing
Input
GPT-5.5 Pro$30/M
Output
GPT-5.5 Pro$180/M
Cached input
GPT-5.5 Pron/a
Input
DeepSeek V4 Flash$0.15/M
Output
DeepSeek V4 Flash$0.3/M
Cached input
DeepSeek V4 Flash$0.003/M
Context & Output
Context length
GPT-5.5 Pro1.1M
Max output tokens
GPT-5.5 Pro128K
Context length
DeepSeek V4 Flash1M
Max output tokens
DeepSeek V4 Flash384K
Capabilities
Reasoning
GPT-5.5 Pro
Knowledge
GPT-5.5 Pro2025-12-01
Attachment
GPT-5.5 Pro
Input modalities
GPT-5.5 ProImage, PDF, Text
Output modalities
GPT-5.5 ProText
Temperature
GPT-5.5 Pro
Tool use
GPT-5.5 Pro
Reasoning
DeepSeek V4 Flash
Knowledge
DeepSeek V4 Flash2025-05-01
Attachment
DeepSeek V4 Flash
Input modalities
DeepSeek V4 FlashText
Output modalities
DeepSeek V4 FlashText
Temperature
DeepSeek V4 Flash
Tool use
DeepSeek V4 Flash
Benchmark
Coding
n/a
GPT-5.5 Pro
wins
38.7
DeepSeek V4 Flash
GPT-5.5 ProOpenAI
DeepSeek V4 FlashDeepSeek
Knowledge & Reasoning
GPQA
n/a
HLE
n/a
GPQA
wins89.4%
HLE
wins32.1%
Coding
SciCode
n/a
Terminal-Bench Hard
n/a
SciCode
wins44.9%
Terminal-Bench Hard
wins35.6%
Instruction Following & Agent Tasks
IFBench
n/a
AA-LCR
n/a
Tau2
n/a
IFBench
wins79.2%
AA-LCR
wins63%
Tau2
wins95.0%
FAQ
Which model is better, GPT-5.5 Pro or DeepSeek V4 Flash?+
GPT-5.5 Pro and DeepSeek V4 Flash should be compared by workload. This page places price, context, output limits, capabilities, and benchmark data side by side. It is also relevant to: deepseek vs chatgpt, chatgpt vs deepseek, deepseek vs chatgpt comparison, deepseek ai vs chatgpt, deepseek vs openai, openai vs deepseek.
Is DeepSeek V4 Flash cheaper than GPT-5.5 Pro?+
Use the pricing rows above to compare input, output, and cached input prices for GPT-5.5 Pro and DeepSeek V4 Flash.
Which model supports a longer context length?+
GPT-5.5 Pro lists 1.1M context length, while DeepSeek V4 Flash lists 1M.
Can I access both models through TokenHub?+
If both models are available in the TokenHub catalog, you can route requests to GPT-5.5 Pro and DeepSeek V4 Flash through the TokenHub API.