o3 vs InternVL 2.5 78B

Compare o3 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 o3 InternVL 2.5 78B
CategoryReasoningVision
Parameters~1T78B
Context Window200K128K
Input Price$0.10/1M tokens$0.05/1M tokens
Output Price$0.40/1M tokens$0.10/1M tokens
Latency~2000ms~400ms

Choose o3 when:

  • ✓ Complex calculations
  • ✓ Multi-factor analysis
  • ✓ Research-grade work
Key Strengths:

Extended thinking, Complex logic, Mathematical reasoning

Choose InternVL 2.5 78B when:

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

Strong visual reasoning, Open weights, Good OCR

Verdict: o3 vs InternVL 2.5 78B

For cost efficiency, InternVL 2.5 78B wins at $0.05/1M input tokens. For speed, o3 is faster at ~2000ms. o3 excels at Complex calculations 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

o3 costs $0.10/1M input tokens and $0.40/1M output tokens. InternVL 2.5 78B costs $0.05 input and $0.10 output. InternVL 2.5 78B is 2.0x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

o3 has a 200K context window with ~2000ms latency. InternVL 2.5 78B offers 128K context at ~400ms. o3 has the larger context window.

Best For

o3 (Reasoning) is optimized for: Complex calculations, Multi-factor analysis, Research-grade work. 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 o3
response_a = client.chat.completions.create(
    model="o3",
    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"}]
)

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Get API Key Try in Playground

Frequently Asked Questions

Which is better, o3 or InternVL 2.5 78B?

o3 (Reasoning, ~1T) offers Extended thinking. InternVL 2.5 78B (Vision, 78B) offers Strong visual reasoning. Choose o3 for Complex calculations or InternVL 2.5 78B for Document analysis.

How much does o3 cost vs InternVL 2.5 78B?

o3: $0.10/1M input, $0.40/1M 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 o3 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.