Intelligence
wins
54.8
GPT-5.5
40.3
DeepSeek V4 Flash
GPT-5.5 vs DeepSeek V4 Flash
GPT-5.5 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-5.5OpenAI
DeepSeek V4 FlashDeepSeek
Basic Information
Name
GPT-5.5GPT-5.5
Model id
GPT-5.5gpt-5.5
Intro
GPT-5.5GPT-5.5 is described by OpenAI as a smarter frontier model for coding, research, data analysis, and professional knowledge work. The official launch messaging emphasizes higher capability, better speed than previous difficult-work models, and strong performance on tasks involving documents and structured analysis. Its description should focus on broad professional intelligence rather than a single niche.
Author
GPT-5.5OpenAI
Released date
GPT-5.52026-04-23
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$5/M
Output
GPT-5.5$30/M
Cached input
GPT-5.5$0.5/M
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-5.51.1M
Max output tokens
GPT-5.5128K
Context length
DeepSeek V4 Flash1M
Max output tokens
DeepSeek V4 Flash384K
Capabilities
Reasoning
GPT-5.5
Knowledge
GPT-5.52025-12-01
Attachment
GPT-5.5
Input modalities
GPT-5.5Image, PDF, Text
Output modalities
GPT-5.5Text
Temperature
GPT-5.5
Tool use
GPT-5.5
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
wins
59.1
GPT-5.5
38.7
DeepSeek V4 Flash
GPT-5.5OpenAI
DeepSeek V4 FlashDeepSeek
Knowledge & Reasoning
GPQA
wins93.5%
HLE
wins44.3%
GPQA
89.4%
HLE
32.1%
Coding
SciCode
wins56.1%
Terminal-Bench Hard
wins60.6%
SciCode
44.9%
Terminal-Bench Hard
35.6%
Instruction Following & Agent Tasks
IFBench
75.9%
AA-LCR
wins74.3%
Tau2
93.9%
IFBench
wins79.2%
AA-LCR
63%
Tau2
wins95.0%
FAQ
Which model is better, GPT-5.5 or DeepSeek V4 Flash?+
GPT-5.5 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?+
Use the pricing rows above to compare input, output, and cached input prices for GPT-5.5 and DeepSeek V4 Flash.
Which model supports a longer context length?+
GPT-5.5 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 and DeepSeek V4 Flash through the TokenHub API.