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

DeepSeek-V4.1-Flash-1017 leads the LLM Stats Score 51.0 to 32.0. DeepSeek-V4.1-Flash-1017 is 21.4x cheaper per token.

DeepSeek · OpenAI · Updated for 2026

Which is better?

DeepSeek-V4.1-Flash-1017 leads the overall LLM Stats Score 51.0 to 32.0, ranking #15 overall.

On price, DeepSeek-V4.1-Flash-1017 is roughly 21.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

DeepSeek-V4.1-Flash-1017 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose DeepSeek-V4.1-Flash-1017

  • overall performance matters — it scores 51.0 and ranks #15 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • cost matters — it's about 21.4x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Oct 2026
  • you need open weights you can self-host or fine-tune

Choose GPT-5.5 Instant

  • you want predictable pricing at $5.00/M input and $30.00/M output

At a glance

The differences that matter most.

DeepSeek-V4.1-Flash-1017
DeepSeek
GPT-5.5 Instant
OpenAI
Core performance indexes
LLM Stats Score
51.0
#15
32.0
#126
Reasoning
48.6
#18
30.9
#133
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.30 / M
$5.00 / M
Output price
$1.20 / M
$30.00 / M
Context window
1,048,576
400,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
DeepSeek-V4.1-Flash-1017
GPT-5.5 Instant
Vision
32.2#26
21.4#79
Multimodal
35.0#14
23.6#68
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

11 reported for DeepSeek-V4.1-Flash-1017 · 9 for GPT-5.5 Instant

No common benchmarks found

DeepSeek-V4.1-Flash-1017 and GPT-5.5 Instantdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

DeepSeek-V4.1-Flash-1017 costs less

For input processing, DeepSeek-V4.1-Flash-1017 ($0.30/1M tokens) is 16.7x cheaper than GPT-5.5 Instant ($5.00/1M tokens).

For output processing, DeepSeek-V4.1-Flash-1017 ($1.20/1M tokens) is 25.0x cheaper than GPT-5.5 Instant ($30.00/1M tokens).

In conclusion, GPT-5.5 Instant is more expensive than DeepSeek-V4.1-Flash-1017.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Mon Oct 19 2026 • llm-stats.com
DeepSeek
DeepSeek-V4.1-Flash-1017
Input tokens$0.30
Output tokens$1.20
Best providerDeepSeek
OpenAI
GPT-5.5 Instant
Input tokens$5.00
Output tokens$30.00
Best providerOpenAI
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

DeepSeek-V4.1-Flash-1017 accepts 1,048,576 input tokens compared to GPT-5.5 Instant's 400,000 tokens. DeepSeek-V4.1-Flash-1017 can generate longer responses up to 393,216 tokens, while GPT-5.5 Instant is limited to 128,000 tokens.

DeepSeek
DeepSeek-V4.1-Flash-1017
Input1,048,576 tokens
Output393,216 tokens
OpenAI
GPT-5.5 Instant
Input400,000 tokens
Output128,000 tokens
Mon Oct 19 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both DeepSeek-V4.1-Flash-1017 and GPT-5.5 Instant support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

DeepSeek-V4.1-Flash-1017

Text
Images
Audio
Video

GPT-5.5 Instant

Text
Images
Audio
Video

License

Usage and distribution terms

DeepSeek-V4.1-Flash-1017 is licensed under MIT, while GPT-5.5 Instant uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

DeepSeek-V4.1-Flash-1017

MIT

Open weights

GPT-5.5 Instant

Proprietary

Closed source

Release Timeline

When each model was launched

DeepSeek-V4.1-Flash-1017 was released on 2026-10-17, while GPT-5.5 Instant was released on 2026-05-05.

DeepSeek-V4.1-Flash-1017 is 6 months newer than GPT-5.5 Instant.

DeepSeek-V4.1-Flash-1017

Oct 17, 2026

2 days ago

5mo newer
GPT-5.5 Instant

May 5, 2026

5 months ago

Knowledge Cutoff

When training data ends

GPT-5.5 Instant has a documented knowledge cutoff of 2025-08-31, while DeepSeek-V4.1-Flash-1017's cutoff date is not specified.

We can confirm GPT-5.5 Instant's training data extends to 2025-08-31, but cannot make a direct comparison without DeepSeek-V4.1-Flash-1017's cutoff date.

DeepSeek-V4.1-Flash-1017

—

GPT-5.5 Instant

Aug 2025

Provider Availability

DeepSeek-V4.1-Flash-1017 is available from DeepSeek. GPT-5.5 Instant is available from OpenAI.

DeepSeek-V4.1-Flash-1017

deepseek logo
DeepSeek
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M

GPT-5.5 Instant

openai logo
OpenAI
Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against DeepSeek-V4.1-Flash-1017 and GPT-5.5 Instant side-by-side, then vote on the output you prefer.

DeepSeek-V4.1-Flash-1017
✓ Preferred
GPT-5.5 Instant
Open in Playground

FAQ

Common questions about DeepSeek-V4.1-Flash-1017 vs GPT-5.5 Instant.

Which is better, DeepSeek-V4.1-Flash-1017 or GPT-5.5 Instant?

DeepSeek-V4.1-Flash-1017 leads the LLM Stats Score 51.0 to 32.0. DeepSeek-V4.1-Flash-1017 is made by DeepSeek and GPT-5.5 Instant is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does DeepSeek-V4.1-Flash-1017 compare to GPT-5.5 Instant in benchmarks?

DeepSeek-V4.1-Flash-1017 scores BabyVision: 92.5%, Chartography: 83.0%, DeepSWE 1.1: 77.0%, NL2Repo: 68.2%, AutomationBench: 60.5%. GPT-5.5 Instant scores HealthBench Consensus: 94.7%, OmniDocBench 1.5: 87.5%, GPQA: 85.6%, CharXiv-R: 81.6%, AIME 2025: 81.2%.

Is DeepSeek-V4.1-Flash-1017 cheaper than GPT-5.5 Instant?

DeepSeek-V4.1-Flash-1017 is 16.7x cheaper for input tokens. DeepSeek-V4.1-Flash-1017 costs $0.30/M input and $1.20/M output via deepseek. GPT-5.5 Instant costs $5.00/M input and $30.00/M output via openai.

What are the context window sizes for DeepSeek-V4.1-Flash-1017 and GPT-5.5 Instant?

DeepSeek-V4.1-Flash-1017 supports 1.0M tokens and GPT-5.5 Instant supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between DeepSeek-V4.1-Flash-1017 and GPT-5.5 Instant?

Key differences include LLM Stats Score (51.0 vs 32.0), context window (1.0M vs 400K), input pricing ($0.30 vs $5.00/M), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes DeepSeek-V4.1-Flash-1017 and GPT-5.5 Instant?

DeepSeek-V4.1-Flash-1017 is developed by DeepSeek and GPT-5.5 Instant is developed by OpenAI.

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