Model Comparison
GPT-5.4 vs DeepSeek-V2.5Which is better in 2026?
Comparing GPT-5.4 and DeepSeek-V2.5 across benchmarks, pricing, and capabilities.
Verdict: GPT-5.4 vs DeepSeek-V2.5 — which is better?
GPT-5.4 (by OpenAI) and DeepSeek-V2.5 (by DeepSeek) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
On price, DeepSeek-V2.5 is roughly 32.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.4 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose GPT-5.4 if…
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Mar 2026
Choose DeepSeek-V2.5 if…
- cost matters — it's about 32.1x cheaper per token
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.4 and DeepSeek-V2.5 don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.4 ($2.50/1M tokens) is 17.9x more expensive than DeepSeek-V2.5 ($0.14/1M tokens).
For output processing, GPT-5.4 ($15.00/1M tokens) is 53.6x more expensive than DeepSeek-V2.5 ($0.28/1M tokens).
In conclusion, GPT-5.4 is more expensive than DeepSeek-V2.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.4 accepts 1,000,000 input tokens compared to DeepSeek-V2.5's 8,192 tokens. GPT-5.4 can generate longer responses up to 128,000 tokens, while DeepSeek-V2.5 is limited to 8,192 tokens.
Input Capabilities
Supported data types and modalities
GPT-5.4 supports multimodal inputs, whereas DeepSeek-V2.5 does not.
GPT-5.4 can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-5.4
DeepSeek-V2.5
License
Usage and distribution terms
GPT-5.4 is licensed under a proprietary license, while DeepSeek-V2.5 uses deepseek.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
deepseek
Open weights
Release Timeline
When each model was launched
GPT-5.4 was released on 2026-03-05, while DeepSeek-V2.5 was released on 2024-05-08.
GPT-5.4 is 22 months newer than DeepSeek-V2.5.
Mar 5, 2026
3 months ago
1.8yr newerMay 8, 2024
2.1 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GPT-5.4 is available from OpenAI. DeepSeek-V2.5 is available from DeepSeek, DeepInfra, Hyperbolic.
GPT-5.4
DeepSeek-V2.5
Outputs Comparison
Key Takeaways
GPT-5.4
View detailsOpenAI
DeepSeek-V2.5
View detailsDeepSeek
Detailed Comparison
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FAQ
Common questions about GPT-5.4 vs DeepSeek-V2.5.