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Every score has a dated snapshot.

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  3. DeepSeek: DeepSeek V3.1 Terminus vs Gemini 3 Flash

Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)

DeepSeek: DeepSeek V3.1 Terminus vs Gemini 3 Flash benchmark

In this head-to-head showdown, DeepSeek: DeepSeek V3.1 Terminus is more budget-friendly at $0.95/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.

Executive Comparison Verdict

Bottom Line: Both DeepSeek: DeepSeek V3.1 Terminus and Gemini 3 Flash present distinct architectural strengths. Compare the verified benchmark matrix below to choose the model tailored to your specific application requirements.
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DeepSeek
DeepSeek: DeepSeek V3.1 Terminus

Auto-discovered from OpenRouter (deepseek/deepseek-v3.1-terminus). Preview until a second source matches.

$0.95/1M out
Google
Gemini 3 Flash

Fast Google frontier-adjacent model. Near-top official SWE-bench at a fraction of Opus price.

Flash TurboElo 1,495$3/1M out
Top Rival Showdowns for DeepSeek: DeepSeek V3.1 Terminus
All Matchups
Compare vs:vs Claude Opus 4.5vs GPT-5vs Gemini 3 Provs Grok 4.6vs Qwen 3 Max
Preference Leader

No shared data

Single model data

Throughput Leader

No shared data

No latency data

Value per Dollar Leader

DeepSeek: DeepSeek V3.1 Terminus

$0.95 / 1M output

Capability Percentiles

Relative percentile scores computed across all active models in the benchmark catalog.

Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect
Percentile 0–100
Dimensional AdvantageGemini 3 Flash 5/6
Head-to-Head Comparison

Overall Matchup Breakdown

Category wins across reasoning intelligence, generation speed, and token cost.

DeepSeek: DeepSeek V3.1 Terminus (2)vsGemini 3 Flash (8)
DeepSeek: DeepSeek V3.1 Terminus: 2W (20%)Overall: Gemini 3 FlashGemini 3 Flash: 8W (80%)
← DeepSeek: DeepSeek V3.1 TerminusGemini 3 Flash →
Gemini 3 Flash (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo
—vs1,495
Coding Elo
—vs1,510
SWE-bench
—vs75.8%
LiveBench
—vs66.8%
GPQA Diamond
—vs78.4%
DeepSeek: DeepSeek V3.1 Terminus: 0WGemini 3 Flash: 5W
Gemini 3 Flash (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed
—vs190 tok/s
Time to first token
—vs95 ms
DeepSeek: DeepSeek V3.1 Terminus: 0WGemini 3 Flash: 2W
DeepSeek: DeepSeek V3.1 Terminus (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price
$0.95/1Mvs$3/1M
Input price
$0.27/1Mvs$0.5/1M
Context window
164kvs1M
DeepSeek: DeepSeek V3.1 Terminus: 2WGemini 3 Flash: 1W

Side-by-Side Benchmark Matrix

Preference Elo
DeepSeek: DeepSeek V3.1 Terminus—
Gemini 3 Flash1,495
lmarena · Aug 17, 2026
Coding Elo
DeepSeek: DeepSeek V3.1 Terminus—
Gemini 3 Flash1,510
lmarena · Aug 17, 2026
LiveBench
DeepSeek: DeepSeek V3.1 Terminus—
Gemini 3 Flash66.8%
livebench · Aug 17, 2026
SWE-bench
DeepSeek: DeepSeek V3.1 Terminus—
Gemini 3 Flash75.8%
swebench · Aug 17, 2026
GPQA Diamond
DeepSeek: DeepSeek V3.1 Terminus—
Gemini 3 Flash78.4%
seed-bootstrap · Aug 1, 2026
Time to first token
DeepSeek: DeepSeek V3.1 Terminus—
Gemini 3 Flash95 ms
seed-bootstrap · Aug 1, 2026
Output speed
DeepSeek: DeepSeek V3.1 Terminus—
Gemini 3 Flash190 tok/s
seed-bootstrap · Aug 1, 2026
Input priceDeepSeek: DeepSeek V3.1 Terminus (+$0.23/1M)
DeepSeek: DeepSeek V3.1 Terminus$0.27/1M
openrouter · Aug 17, 2026
Gemini 3 Flash$0.5/1M
openrouter · Aug 17, 2026
Output priceDeepSeek: DeepSeek V3.1 Terminus (+$2.05/1M)
DeepSeek: DeepSeek V3.1 Terminus$0.95/1M
openrouter · Aug 17, 2026
Gemini 3 Flash$3/1M
openrouter · Aug 17, 2026
Context windowGemini 3 Flash (+885k)
DeepSeek: DeepSeek V3.1 Terminus164k
openrouter · Aug 17, 2026
Gemini 3 Flash1M
openrouter · Aug 17, 2026
BenchmarkDeepSeek: DeepSeek V3.1 TerminusGemini 3 FlashAdvantage Delta
Preference Elo—
1,495
lmarena · Aug 17, 2026
—
Coding Elo—
1,510
lmarena · Aug 17, 2026
—
LiveBench—
66.8%
livebench · Aug 17, 2026
—
SWE-bench—
75.8%
swebench · Aug 17, 2026
—
GPQA Diamond—
78.4%
seed-bootstrap · Aug 1, 2026
—
Time to first token—
95 ms
seed-bootstrap · Aug 1, 2026
—
Output speed—
190 tok/s
seed-bootstrap · Aug 1, 2026
—
Input price
$0.27/1M
openrouter · Aug 17, 2026
$0.5/1M
openrouter · Aug 17, 2026
DeepSeek: DeepSeek V3.1 Terminus (+$0.23/1M)
Output price
$0.95/1M
openrouter · Aug 17, 2026
$3/1M
openrouter · Aug 17, 2026
DeepSeek: DeepSeek V3.1 Terminus (+$2.05/1M)
Context window
164k
openrouter · Aug 17, 2026
1M
openrouter · Aug 17, 2026
Gemini 3 Flash (+885k)
Interactive Simulator (USD)

Workload Cost & Savings Calculator

Simulate monthly production API costs in USD (US Dollar).

Save up to 62% with DeepSeek: DeepSeek V3.1 Terminus
Monthly Volume50M tokens/mo
Quick Presets:
Token Ratio (In vs Out)70% In / 30% Out
RAG / Search (10% out)Coding / Chat (50% out)
DeepSeek: DeepSeek V3.1 Terminus$23.70 / mo
In: $9.45Out: $14.25
Gemini 3 Flash$62.50 / mo
In: $17.5Out: $45
Estimated Cost Delta

DeepSeek: DeepSeek V3.1 Terminus is estimated to save $38.80/month ($466/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

  • 1
    DeepSeek: DeepSeek V3.1 Terminus:Pick DeepSeek: DeepSeek V3.1 Terminus when you are optimizing output cost.
  • 2
    Gemini 3 Flash:Pick Gemini 3 Flash for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatDeepSeek: DeepSeek V3.1 Terminus

Lower output list price ($0.95/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGGemini 3 Flash

Larger window (1M).

Screenshots / visionGemini 3 Flash

Gemini 3 Flash is the side marked multimodal in the catalog.

Target WorkloadRecommended PickEvaluation Rationale
Repo / coding agentsinsufficient dataNeed SWE-bench on both sides.
High-volume chatDeepSeek: DeepSeek V3.1 TerminusLower output list price ($0.95/1M).
Voice / low-latency UIinsufficient dataNeed TTFT on both sides.
Long-document RAGGemini 3 FlashLarger window (1M).
Screenshots / visionGemini 3 FlashGemini 3 Flash is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news
launchMar 16, 2026

Gemini 3 Flash: near-top official SWE-bench at a fraction of Opus

March 2026 speed SKU. Still a useful cheap-coding compare even after 3.6/3.7 Flash.

Community Sentiment

Cast Your Matchup Vote

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CompareLLM Matrix

Verified head-to-head card

LIVE
VS
DeepSeek

DeepSeek: DeepSeek V3.1 Terminus

Elo n/a
LiveBench—
SWE-bench—
Speed—
Output cost$0.95/1M
Google

Gemini 3 Flash

Elo 1,495
LiveBench66.8%
SWE-bench75.8%
Speed190 tok/s
Output cost$3/1M

Frequently Asked Questions

Which is better overall, DeepSeek: DeepSeek V3.1 Terminus or Gemini 3 Flash?
We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.
Which is better at coding, DeepSeek: DeepSeek V3.1 Terminus or Gemini 3 Flash?
SWE-bench is missing for at least one model, so we do not rank coding from a single number.
Which is cheaper to run in production?
DeepSeek: DeepSeek V3.1 Terminus output tokens are $0.95/1M versus $3/1M. Input prices and retry rates still move the real bill.
Which is faster, DeepSeek: DeepSeek V3.1 Terminus or Gemini 3 Flash?
We do not have TTFT for both models.
Which has the larger context window?
Gemini 3 Flash accepts 1M tokens versus 164k.
Can I self-host either model?
Neither model is marked open-weights here. You are comparing hosted APIs.
Are these scores from CompareLLM’s own evals?
No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?
Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. DeepSeek: DeepSeek V3.1 Terminus and Gemini 3 Flash Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Related news

  • launch · Mar 16, 2026

    Gemini 3 Flash: near-top official SWE-bench at a fraction of Opus

Similar Head-to-Head Comparisons

All DeepSeek: DeepSeek V3.1 Terminus matchups →|All Gemini 3 Flash matchups →
Gemini 3 Flash vs Gemini 2.5 Flash (previous gemini-flash)Gemini 3 Flash vs Gemini 3.6 Flash (next gemini-flash)Gemini 3 Pro vs Gemini 3 FlashGemini 2.0 Flash Thinking vs Gemini 3 FlashGemini 3.6 Pro vs Gemini 3 FlashGemini 3.7 Flash vs Gemini 3 Flash