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  3. Deep Cogito: Cogito v2.1 671B vs Gemini 2.5 Flash

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

Deep Cogito: Cogito v2.1 671B vs Gemini 2.5 Flash benchmark

In this head-to-head showdown, Deep Cogito: Cogito v2.1 671B is more budget-friendly at $1.25/1M 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 Deep Cogito: Cogito v2.1 671B and Gemini 2.5 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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Executive Verdict Summary

Gemini 2.5 Flash holds empirical advantage (2 of 3 metrics)

Coding / SWESWE-bench
Gemini 2.5 FlashTop code solve rate
ReasoningGPQA / Live
Gemini 2.5 FlashTop logical accuracy
Best Value$/1M Tok
Deep Cogito: Cogito v2.1 671BLowest API billing cost
Speed / TokTok/Sec
Gemini 2.5 FlashFastest stream rate

Verified Advantage Breakdown

3 benchmarks evaluated across capability, speed, and cost

Deep Cogito: Cogito v2.1 671B (1)Gemini 2.5 Flash (2)
Deep Cogito: Cogito v2.1 671B
1 of 3 Wins
✓Output price
Gemini 2.5 Flash
2 of 3 Wins
✓Input price✓Context window
deepcogito
Leads 1 of 3
Deep Cogito: Cogito v2.1 671B

Auto-discovered from OpenRouter (deepcogito/cogito-v2.1-671b). Preview until a second source matches.

In: $1.25 · Out: $1.25/1M
Google
Leads 2 of 3
Gemini 2.5 Flash

Previous Google speed workhorse.

2.5 FlashElo 1,295In: $0.3 · Out: $2.5/1M
Top Rival Showdowns for Deep Cogito: Cogito v2.1 671B
All Matchups
Compare vs:vs Claude Opus 4.5vs GPT-5vs Gemini 3 Provs Grok 4.6vs DeepSeek V4 Pro
Preference Leader

No shared data

Single model data

Throughput Leader

No shared data

No latency data

Value per Dollar LeaderDeep Cogito: Cogito v2.1 671B Wins

Deep Cogito: Cogito v2.1 671B

$1.25 / 1M output

Capability Percentiles

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

Multi-Dimensional Capability Radar

Leaders Matchup Capability Radar

Comparing top standard models across 6 key capability dimensions. Tap any spoke or dot to inspect.

Tap any node to inspect
0–100 %ile

Overall Matchup Breakdown

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

Deep Cogito: Cogito v2.1 671B (1)vsGemini 2.5 Flash (8)
Deep Cogito: Cogito v2.1 671B: 1W (11%)Overall: Gemini 2.5 FlashGemini 2.5 Flash: 8W (89%)
← Deep Cogito: Cogito v2.1 671BGemini 2.5 Flash →
🏆Gemini 2.5 Flash Leads(4/5)

Intelligence & Reasoning

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

Benchmark
Deep Cogito: Cogito v2.1 671BvsGemini 2.5 Flash
Preference Elo
—vs1,295
Coding Elo
—vs—
SWE-bench
—vs48%
LiveBench
—vs51.4%
GPQA Diamond
—vs68.2%
Deep Cogito: Cogito v2.1 671B: 0WGemini 2.5 Flash: 4W
🏆Gemini 2.5 Flash Leads(2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Benchmark
Deep Cogito: Cogito v2.1 671BvsGemini 2.5 Flash
Output speed
—vs185 tok/s
Time to first token
—vs110 ms
Deep Cogito: Cogito v2.1 671B: 0WGemini 2.5 Flash: 2W
🏆Gemini 2.5 Flash Leads(2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Benchmark
Deep Cogito: Cogito v2.1 671BvsGemini 2.5 Flash
Output price
$1.25/1Mvs$2.5/1M+$1.25/1M
Input price
$1.25/1Mvs$0.3/1M+$0.95/1M
Context window
128kvs1M+921k
Deep Cogito: Cogito v2.1 671B: 1WGemini 2.5 Flash: 2W

Side-by-Side Benchmark Matrix

Deep Cogito: Cogito v2.1 671BGemini 2.5 Flash
Preference Elo
Deep Cogito: Cogito v2.1 671B—
Gemini 2.5 Flash1,295
LiveBench
Deep Cogito: Cogito v2.1 671B—
Gemini 2.5 Flash51.4%
SWE-bench
Deep Cogito: Cogito v2.1 671B—
Gemini 2.5 Flash48%
GPQA Diamond
Deep Cogito: Cogito v2.1 671B—
Gemini 2.5 Flash68.2%
Time to first token
Deep Cogito: Cogito v2.1 671B—
Gemini 2.5 Flash110 ms
Output speed
Deep Cogito: Cogito v2.1 671B—
Gemini 2.5 Flash185 tok/s
Input priceGemini 2.5 Flash +$0.95/1M
Deep Cogito: Cogito v2.1 671B$1.25/1M
Gemini 2.5 Flash$0.3/1M
Output priceDeep Cogito: Cogito v2.1 671B +$1.25/1M
Deep Cogito: Cogito v2.1 671B$1.25/1M
Gemini 2.5 Flash$2.5/1M
Context windowGemini 2.5 Flash +921k
Deep Cogito: Cogito v2.1 671B128k
Gemini 2.5 Flash1M
BenchmarkDeep Cogito: Cogito v2.1 671BGemini 2.5 FlashAdvantage Delta
Preference Elo—
1,295
lmarena · Aug 17, 2026
—
LiveBench—
51.4%
livebench · Aug 17, 2026
—
SWE-bench—
48%
swebench · Aug 17, 2026
—
GPQA Diamond—
68.2%
seed-bootstrap · Aug 1, 2026
—
Time to first token—
110 ms
seed-bootstrap · Aug 1, 2026
—
Output speed—
185 tok/s
seed-bootstrap · Aug 1, 2026
—
Input price
$1.25/1M
openrouter · Aug 17, 2026
$0.3/1M
openrouter · Aug 17, 2026
+$0.95/1M
Output price
$1.25/1M
openrouter · Aug 17, 2026
$2.5/1M
openrouter · Aug 17, 2026
+$1.25/1M
Context window
128k
openrouter · Aug 17, 2026
1M
openrouter · Aug 17, 2026
+921k

Workload Cost & Savings Calculator

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

Save 23% with Gemini 2.5 Flash
Monthly Volume50M tokens/mo
Quick Presets:
Token Ratio (In vs Out)70% In / 30% Out
RAG / Search (10% out)Coding / Chat (50% out)
Deep Cogito: Cogito v2.1 671B$62.50 / mo
In: $43.75Out: $18.75
Gemini 2.5 Flash$48.00 / mo
In: $10.5Out: $37.5
Estimated Cost Delta

Gemini 2.5 Flash is estimated to save $14.50/month ($174/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

  • 1
    Deep Cogito: Cogito v2.1 671B:Pick Deep Cogito: Cogito v2.1 671B when you are optimizing output cost.
  • 2
    Gemini 2.5 Flash:Pick Gemini 2.5 Flash for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatDeep Cogito: Cogito v2.1 671B

Lower output list price ($1.25/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGGemini 2.5 Flash

Larger window (1M).

Screenshots / visionGemini 2.5 Flash

Gemini 2.5 Flash is the side marked multimodal in the catalog.

Target WorkloadRecommended PickEvaluation Rationale
Repo / coding agentsinsufficient dataNeed SWE-bench on both sides.
High-volume chatDeep Cogito: Cogito v2.1 671BLower output list price ($1.25/1M).
Voice / low-latency UIinsufficient dataNeed TTFT on both sides.
Long-document RAGGemini 2.5 FlashLarger window (1M).
Screenshots / visionGemini 2.5 FlashGemini 2.5 Flash is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news
launchMar 25, 2025

Gemini 2.5 Flash: previous Google speed workhorse, still a baseline

Useful as a cheap historical compare. 3.7 Flash is the 2026 volume SKU.

Cast Your Matchup Vote

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CompareLLM AI Matrix

Verified Head-to-Head Telemetry

LIVE BENCHMARK
VS
deepcogito

Deep Cogito: Cogito v2.1 671B

Elo n/a
SWE-bench—
Speed (tok/s)128k
Input / 1M Tokens$1.25/1M
Output / 1M Tokens$1.25/1M
Google

Gemini 2.5 Flash

Elo 1,295
SWE-bench48%
Speed (tok/s)185 tok/s
Input / 1M Tokens$0.3/1M
Output / 1M Tokens$2.5/1M

Frequently Asked Questions

Which is better overall, Deep Cogito: Cogito v2.1 671B or Gemini 2.5 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, Deep Cogito: Cogito v2.1 671B or Gemini 2.5 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?
Deep Cogito: Cogito v2.1 671B output tokens are $1.25/1M versus $2.5/1M. Input prices and retry rates still move the real bill.
Which is faster, Deep Cogito: Cogito v2.1 671B or Gemini 2.5 Flash?
We do not have TTFT for both models.
Which has the larger context window?
Gemini 2.5 Flash accepts 1M tokens versus 128k.
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. Deep Cogito: Cogito v2.1 671B and Gemini 2.5 Flash Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Related news

  • launch · Mar 25, 2025

    Gemini 2.5 Flash: previous Google speed workhorse, still a baseline

Similar Head-to-Head Comparisons

All Deep Cogito: Cogito v2.1 671B matchups →|All Gemini 2.5 Flash matchups →
Gemini 2.5 Flash vs Gemini 2.0 Flash Thinking (previous gemini-flash)Gemini 2.5 Flash vs Gemini 3 Flash (next gemini-flash)Gemini 3 Pro vs Gemini 2.5 FlashGemini 3.6 Pro vs Gemini 2.5 FlashGemini 3.6 Flash vs Gemini 2.5 FlashGemini 3.7 Flash vs Gemini 2.5 Flash