GPT-5.5 vs DeepSeek V4 Pro

GPT-5.5 from OpenAI and DeepSeek V4 Pro 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.

Overall Recommendation

GPT-5.5 is the stronger capability default, leading TokenHub’s overall Intelligence and Coding indexes while adding image and PDF input. Choose DeepSeek V4 Pro for much lower text-token cost and a 384K maximum output.

Recommendation based on GPT-5.5 (xhigh) vs DeepSeek V4 Pro (Reasoning, Max Effort).

Comparison Highlights

GPT-5.5OpenAI
DeepSeek V4 ProDeepSeek
Best For
Professional codingresearchdocument-heavy work
Long-context reasoningcodebase analysiscost control
How To Read ItUse-case synthesis from model capabilities and positioning.
Workload Fit
CodingAnalysisKnowledge work
ReasoningCodingLong context
How To Read ItThe workloads each model is most directly shaped for.
Input
$5/M
$1.2857/MEdge
How To Read ItLower is better when prompts or retrieval payloads are large.
Output
$30/M
$3.8571/MEdge
How To Read ItLower is better for reasoning-heavy or long-generation traffic.
Context length
1.1M
1M
How To Read ItHigher is better for repositories, retrieval packs, and transcripts.
Input modalities
Image, PDF, TextEdge
Text
How To Read ItBroader input support reduces the need for separate vision or video models.

Model Selection Guide

GPT-5.5OpenAI

Choose GPT-5.5 When

  • A 54.8 Intelligence Index and 59.1 Coding Index in TokenHub’s xhigh profile
  • $5 input and $30 output per million tokens, with $0.50 cached input
  • A 1.05M context window, 128K maximum output, and text, image, and PDF input
DeepSeek V4 ProDeepSeek

Choose DeepSeek V4 Pro When

  • A 44.3 Intelligence Index and 47.5 Coding Index in TokenHub’s max-effort profile
  • $1.80 input and $3.50 output per million tokens
  • A 1M context window and 384K maximum output for text-only workloads

Basic Information

GPT-5.5OpenAI
DeepSeek V4 ProDeepSeek

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

Context length

GPT-5.51.1M

Max output tokens

GPT-5.5128K

Name

DeepSeek V4 ProDeepSeek V4 Pro

Model id

DeepSeek V4 Prodeepseek-v4-pro

Intro

DeepSeek V4 ProDeepSeek V4 Pro is described as a large-scale Mixture-of-Experts model with 1.6T total parameters and 49B activated parameters, while keeping a 1M-token context window for very large inputs. Its model cards emphasize advanced reasoning, coding, and long-horizon agent workflows rather than simple chat. The Pro variant is the capability-oriented member of the V4 family, making it better suited to full-codebase analysis, large research synthesis, and multi-step automation where depth matters more than the lowest possible latency.

Author

DeepSeek V4 ProDeepSeek

Released date

DeepSeek V4 Pro2026-04-24

Context length

DeepSeek V4 Pro1M

Max output tokens

DeepSeek V4 Pro384K

Pricing

GPT-5.5OpenAI
DeepSeek V4 ProDeepSeek

Input

GPT-5.5$5/M

Output

GPT-5.5$30/M

Cached input

GPT-5.5$0.5/M

Input

DeepSeek V4 Pro$1.2857/M

Output

DeepSeek V4 Pro$3.8571/M

Cached input

DeepSeek V4 Pro$0.0429/M

Capabilities

GPT-5.5OpenAI
DeepSeek V4 ProDeepSeek

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 Pro

Knowledge

DeepSeek V4 Pro2025-05-01

Attachment

DeepSeek V4 Pro

Input modalities

DeepSeek V4 ProText

Output modalities

DeepSeek V4 ProText

Temperature

DeepSeek V4 Pro

Tool use

DeepSeek V4 Pro

Benchmark

GPT-5.5OpenAI
DeepSeek V4 ProDeepSeek

Intelligence

wins54.8

Coding

wins59.1

Intelligence

44.3

Coding

47.5

Knowledge & Reasoning

GPQA

wins93.5%

HLE

wins44.3%

GPQA

88.8%

HLE

35.9%

Coding

SciCode

wins56.1%

Terminal-Bench Hard

wins60.6%

SciCode

50%

Terminal-Bench Hard

46.2%

Instruction Following & Agent Tasks

IFBench

75.9%

AA-LCR

wins74.3%

Tau2

93.9%

IFBench

wins76.5%

AA-LCR

66.3%

Tau2

wins96.2%

FAQ

Which model is better, GPT-5.5 or DeepSeek V4 Pro?

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GPT-5.5 and DeepSeek V4 Pro 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 Pro cheaper than GPT-5.5?

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Use the pricing rows above to compare input, output, and cached input prices for GPT-5.5 and DeepSeek V4 Pro.

Which model supports a longer context length?

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GPT-5.5 lists 1.1M context length, while DeepSeek V4 Pro lists 1M.

Can I access both models through TokenHub?

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If both models are available in the TokenHub catalog, you can route requests to GPT-5.5 and DeepSeek V4 Pro through the TokenHub API.