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DeepSeek V4 Pro 0813 vs Gemini 3.1 Pro

Close to a tie overall. DeepSeek V4 Pro 0813 costs 64% less for the same work.

DeepSeek V4 Pro 0813

by DeepSeek · #19 of 67 overall

Coming soon · price at launch
Context
1M
Input / 1M
$1.30
Output / 1M
$2.60

Gemini 3.1 Pro

by Google · #20 of 67 overall

Coming soon · price at launch
Context
1M
Input / 1M
$2.00
Output / 1M
$12.00

Better overall

About even

Grade 78.5 vs 77.4

Cheaper

DeepSeek V4 Pro 0813

64% less, $1.63 vs $4.50 blended

Larger context

DeepSeek V4 Pro 0813

1M vs 1M tokens

Head to head

Public benchmarks. Longer is better; each value links to its source.

LMArena TextElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
DeepSeek V4 Pro 0813DeepSeek V4 Pro 0813: 1,465
Gemini 3.1 ProGemini 3.1 Pro: 1,487
LMArena WebDevElo-style rating · LMArena (CC BY 4.0) · Oct 13, 2026
DeepSeek V4 Pro 0813DeepSeek V4 Pro 0813: 1,582
Gemini 3.1 ProGemini 3.1 Pro: 1,447
LMArena CodingElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
DeepSeek V4 Pro 0813DeepSeek V4 Pro 0813: 1,505
Gemini 3.1 ProGemini 3.1 Pro: 1,521
SWE-bench Verified% of issues resolved · SWE-bench · Feb 19, 2026 · reference
DeepSeek V4 Pro 0813DeepSeek V4 Pro 0813: —
SWE-Bench Pro% of tasks resolved · Scale AI SWE-Bench Pro · Feb 19, 2026 · reference
DeepSeek V4 Pro 0813DeepSeek V4 Pro 0813: —
Terminal-Bench 2.1% of tasks passed · Terminal-Bench · Aug 13, 2026 · reference
DeepSeek V4 Pro 0813DeepSeek V4 Pro 0813: 87.9%v
Gemini 3.1 ProGemini 3.1 Pro: —
Terminal-Bench 2.0% of tasks passed · Terminal-Bench · Feb 19, 2026 · reference
DeepSeek V4 Pro 0813DeepSeek V4 Pro 0813: —

DeepSeek V4 Pro 0813Gemini 3.1 Prov = reported by the model’s maker. — = no public score yet. Arena bars span the range across every model we grade.

What it costs you

Drag to match your monthly usage.

DeepSeek V4 Pro 0813$364 /month
Gemini 3.1 Pro$880 /month

DeepSeek V4 Pro 0813 saves you $516 a month at this usage, $6,192 a year.

At a glance

AttributeDeepSeek V4 Pro 0813Gemini 3.1 Pro
Made byDeepSeekGoogle
AvailabilityComing soonComing soon
Overall gradeExcellent · 78.5Excellent · 77.4
Overall rank#19 of 67#20 of 67
Input price$1.30 per 1M$2.00 per 1M
Output price$2.60 per 1M$12.00 per 1M
Context window1,048,576 tokens1,000,000 tokens
Reasoning levelsNoYes
Reads imagesNoYes
Model IDdeepseek-v4-pro-0813gemini-3.1-pro

Try both with one key

Same endpoint, same key, both hosted in the USA. Change one word to switch models, in Claude Code, Cursor, Cline or your own code.

Get your API key
# Ask either model the same thing
curl https://fullsendai.com/v1/chat/completions \
  -H "Authorization: Bearer $FULLSEND_API_KEY" \
  -d '{"model": "deepseek-v4-pro-0813", "messages": [...]}'

# …then swap one word
  -d '{"model": "gemini-3.1-pro", "messages": [...]}'

Questions

Is DeepSeek V4 Pro 0813 or Gemini 3.1 Pro better?

They grade within two points of each other (78.5 and 77.4), so pick on price and the benchmarks that match your work.

Which is cheaper, DeepSeek V4 Pro 0813 or Gemini 3.1 Pro?

DeepSeek V4 Pro 0813: $1.30 in and $2.60 out per million tokens, against $2.00 and $12.00 through FullsendAI.

Which has the larger context window?

DeepSeek V4 Pro 0813, with 1,048,576 tokens.

Can I use both with one API key?

Yes, once they launch: both are coming soon, at the prices shown, and both will use the same FullsendAI key.

Model rankingsAll benchmarksCompare other models

Scores: LMArena (CC BY 4.0), SWE-bench, Scale AI SWE-Bench Pro, Terminal-Bench, and model makers’ published results where marked v. Prices are FullsendAI’s, per million tokens. Data as of Oct 28, 2026.