DeepSeek V3.1 vs InternVL 2.5 78B

Compare DeepSeek V3.1 and InternVL 2.5 78B: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.

Updated 2026-05-21 · By Abhishek Raj · Our methodology

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Feature DeepSeek V3.1 InternVL 2.5 78B
CategoryOpen SourceVision
Parameters685B (37B active)78B
Context Window128K128K
Input Price$0.06/1M tokens$0.05/1M tokens
Output Price$0.10/1M tokens$0.10/1M tokens
Latency~400ms~400ms

Choose DeepSeek V3.1 when:

  • ✓ Production apps
  • ✓ Content generation
  • ✓ Multi-language
Key Strengths:

Improved quality, Better safety, Stronger multilingual

Choose InternVL 2.5 78B when:

  • ✓ Document analysis
  • ✓ Chart reading
  • ✓ Visual Q&A
Key Strengths:

Strong visual reasoning, Open weights, Good OCR

Verdict: DeepSeek V3.1 vs InternVL 2.5 78B

For cost efficiency, InternVL 2.5 78B wins at $0.05/1M input tokens. For speed, InternVL 2.5 78B is faster at ~400ms. DeepSeek V3.1 excels at Production apps while InternVL 2.5 78B is better for Document analysis. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.

Detailed Analysis

Pricing Comparison

DeepSeek V3.1 costs $0.06/1M input tokens and $0.10/1M output tokens. InternVL 2.5 78B costs $0.05 input and $0.10 output. InternVL 2.5 78B is 1.2x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

DeepSeek V3.1 has a 128K context window with ~400ms latency. InternVL 2.5 78B offers 128K context at ~400ms. Both have identical context windows.

Best For

DeepSeek V3.1 (Open Source) is optimized for: Production apps, Content generation, Multi-language. InternVL 2.5 78B (Vision) works best for: Document analysis, Chart reading, Visual Q&A.

Try Both on XALEN

Both models are available through XALEN's OpenAI-compatible API. Switch between them by changing the model parameter:

from xalen import XALEN

client = XALEN(api_key="xln_test_YOUR_KEY")

# Use DeepSeek V3.1
response_a = client.chat.completions.create(
    model="deepseek-v3-1",
    messages=[{"role": "user", "content": "Your question here"}]
)

# Use InternVL 2.5 78B
response_b = client.chat.completions.create(
    model="internvl-2-5-78b",
    messages=[{"role": "user", "content": "Your question here"}]
)

Start Building with XALEN

200+ AI models. One API. Pay-as-you-go.

Get API Key Try in Playground

Frequently Asked Questions

Which is better, DeepSeek V3.1 or InternVL 2.5 78B?

DeepSeek V3.1 (Open Source, 685B (37B active)) offers Improved quality. InternVL 2.5 78B (Vision, 78B) offers Strong visual reasoning. Choose DeepSeek V3.1 for Production apps or InternVL 2.5 78B for Document analysis.

How much does DeepSeek V3.1 cost vs InternVL 2.5 78B?

DeepSeek V3.1: $0.06/1M input, $0.10/1M output. InternVL 2.5 78B: $0.05/1M input, $0.10/1M output. Both available on XALEN with batch processing at 50% discount.

Can I use both models on XALEN?

Yes. XALEN provides 200+ models through a single OpenAI-compatible API. Switch between DeepSeek V3.1 and InternVL 2.5 78B by changing the model parameter. No code changes needed.

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Last updated: 2026-05-21. Pricing and specifications may change. Check pricing page for latest rates.