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Every score has a dated snapshot.

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  3. Google: Gemini 3.5 Flash (batch) vs GPT-4.5 Orion

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

Google: Gemini 3.5 Flash (batch) vs GPT-4.5 Orion benchmark

In this head-to-head showdown, Google: Gemini 3.5 Flash (batch) is more budget-friendly at $4.5/1M 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 Google: Gemini 3.5 Flash (batch) and GPT-4.5 Orion present distinct architectural strengths. Compare the verified benchmark matrix below to choose the model tailored to your specific application requirements.
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Google
Google: Gemini 3.5 Flash (batch)

Auto-discovered from OpenRouter (google/gemini-3.5-flash:batch). Preview until a second source matches.

$4.5/1M out
OpenAI
GPT-4.5 Orion

OpenAI largest dense non-reasoning model with expansive world knowledge and reduced hallucinations.

Elo 1,540$150/1M out
Top Rival Showdowns for Google: Gemini 3.5 Flash (batch)
All Matchups
Compare vs:vs Claude Opus 4.5vs GPT-5vs Grok 4.6vs DeepSeek V4 Provs Qwen 3 Max
Preference Leader

No shared data

Single model data

Throughput Leader

No shared data

No latency data

Value per Dollar Leader

Google: Gemini 3.5 Flash (batch)

$4.5 / 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 AdvantageGPT-4.5 Orion 4/6
Head-to-Head Comparison

Overall Matchup Breakdown

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

Google: Gemini 3.5 Flash (batch) (3)vsGPT-4.5 Orion (7)
Google: Gemini 3.5 Flash (batch): 3W (30%)Overall: GPT-4.5 OrionGPT-4.5 Orion: 7W (70%)
← Google: Gemini 3.5 Flash (batch)GPT-4.5 Orion →
GPT-4.5 Orion (5/5)

Intelligence & Reasoning

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

Preference Elo
—vs1,540
Coding Elo
—vs1,520
SWE-bench
—vs71%
LiveBench
—vs68.5%
GPQA Diamond
—vs84%
Google: Gemini 3.5 Flash (batch): 0WGPT-4.5 Orion: 5W
GPT-4.5 Orion (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed
—vs60 tok/s
Time to first token
—vs350 ms
Google: Gemini 3.5 Flash (batch): 0WGPT-4.5 Orion: 2W
Google: Gemini 3.5 Flash (batch) (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price
$4.5/1Mvs$150/1M
Input price
$0.75/1Mvs$75/1M
Context window
1Mvs128k
Google: Gemini 3.5 Flash (batch): 3WGPT-4.5 Orion: 0W

Side-by-Side Benchmark Matrix

Preference Elo
Google: Gemini 3.5 Flash (batch)—
GPT-4.5 Orion1,540
lmarena · Aug 17, 2026
Coding Elo
Google: Gemini 3.5 Flash (batch)—
GPT-4.5 Orion1,520
lmarena · Aug 17, 2026
LiveBench
Google: Gemini 3.5 Flash (batch)—
GPT-4.5 Orion68.5%
livebench · Aug 17, 2026
SWE-bench
Google: Gemini 3.5 Flash (batch)—
GPT-4.5 Orion71%
swebench · Aug 17, 2026
GPQA Diamond
Google: Gemini 3.5 Flash (batch)—
GPT-4.5 Orion84%
seed-bootstrap · Aug 1, 2026
Time to first token
Google: Gemini 3.5 Flash (batch)—
GPT-4.5 Orion350 ms
seed-bootstrap · Aug 1, 2026
Output speed
Google: Gemini 3.5 Flash (batch)—
GPT-4.5 Orion60 tok/s
seed-bootstrap · Aug 1, 2026
Input priceGoogle: Gemini 3.5 Flash (batch) (+$74.25/1M)
Google: Gemini 3.5 Flash (batch)$0.75/1M
openrouter · Aug 17, 2026
GPT-4.5 Orion$75/1M
seed-bootstrap · Aug 1, 2026
Output priceGoogle: Gemini 3.5 Flash (batch) (+$145.5/1M)
Google: Gemini 3.5 Flash (batch)$4.5/1M
openrouter · Aug 17, 2026
GPT-4.5 Orion$150/1M
seed-bootstrap · Aug 1, 2026
Context windowGoogle: Gemini 3.5 Flash (batch) (+921k)
Google: Gemini 3.5 Flash (batch)1M
openrouter · Aug 17, 2026
GPT-4.5 Orion128k
seed-bootstrap · Aug 1, 2026
BenchmarkGoogle: Gemini 3.5 Flash (batch)GPT-4.5 OrionAdvantage Delta
Preference Elo—
1,540
lmarena · Aug 17, 2026
—
Coding Elo—
1,520
lmarena · Aug 17, 2026
—
LiveBench—
68.5%
livebench · Aug 17, 2026
—
SWE-bench—
71%
swebench · Aug 17, 2026
—
GPQA Diamond—
84%
seed-bootstrap · Aug 1, 2026
—
Time to first token—
350 ms
seed-bootstrap · Aug 1, 2026
—
Output speed—
60 tok/s
seed-bootstrap · Aug 1, 2026
—
Input price
$0.75/1M
openrouter · Aug 17, 2026
$75/1M
seed-bootstrap · Aug 1, 2026
Google: Gemini 3.5 Flash (batch) (+$74.25/1M)
Output price
$4.5/1M
openrouter · Aug 17, 2026
$150/1M
seed-bootstrap · Aug 1, 2026
Google: Gemini 3.5 Flash (batch) (+$145.5/1M)
Context window
1M
openrouter · Aug 17, 2026
128k
seed-bootstrap · Aug 1, 2026
Google: Gemini 3.5 Flash (batch) (+921k)
Interactive Simulator (USD)

Workload Cost & Savings Calculator

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

Save up to 98% with Google: Gemini 3.5 Flash (batch)
Monthly Volume50M tokens/mo
Quick Presets:
Token Ratio (In vs Out)70% In / 30% Out
RAG / Search (10% out)Coding / Chat (50% out)
Google: Gemini 3.5 Flash (batch)$93.75 / mo
In: $26.25Out: $67.5
GPT-4.5 Orion$4,875.00 / mo
In: $2,625Out: $2,250
Estimated Cost Delta

Google: Gemini 3.5 Flash (batch) is estimated to save $4,781.25/month ($57,375/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

  • 1
    Google: Gemini 3.5 Flash (batch):Pick Google: Gemini 3.5 Flash (batch) when you are optimizing output cost.
  • 2
    Google: Gemini 3.5 Flash (batch):Pick Google: Gemini 3.5 Flash (batch) for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatGoogle: Gemini 3.5 Flash (batch)

Lower output list price ($4.5/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGGoogle: Gemini 3.5 Flash (batch)

Larger window (1M).

Screenshots / visionGPT-4.5 Orion

GPT-4.5 Orion is the side marked multimodal in the catalog.

Target WorkloadRecommended PickEvaluation Rationale
Repo / coding agentsinsufficient dataNeed SWE-bench on both sides.
High-volume chatGoogle: Gemini 3.5 Flash (batch)Lower output list price ($4.5/1M).
Voice / low-latency UIinsufficient dataNeed TTFT on both sides.
Long-document RAGGoogle: Gemini 3.5 Flash (batch)Larger window (1M).
Screenshots / visionGPT-4.5 OrionGPT-4.5 Orion is the side marked multimodal in the catalog.
Community Sentiment

Cast Your Matchup Vote

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CompareLLM Matrix

Verified head-to-head card

LIVE
VS
Google

Google: Gemini 3.5 Flash (batch)

Elo n/a
LiveBench—
SWE-bench—
Speed—
Output cost$4.5/1M
OpenAI

GPT-4.5 Orion

Elo 1,540
LiveBench68.5%
SWE-bench71%
Speed60 tok/s
Output cost$150/1M

Frequently Asked Questions

Which is better overall, Google: Gemini 3.5 Flash (batch) or GPT-4.5 Orion?
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, Google: Gemini 3.5 Flash (batch) or GPT-4.5 Orion?
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?
Google: Gemini 3.5 Flash (batch) output tokens are $4.5/1M versus $150/1M. Input prices and retry rates still move the real bill.
Which is faster, Google: Gemini 3.5 Flash (batch) or GPT-4.5 Orion?
We do not have TTFT for both models.
Which has the larger context window?
Google: Gemini 3.5 Flash (batch) 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. Google: Gemini 3.5 Flash (batch) and GPT-4.5 Orion Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Google: Gemini 3.5 Flash (batch) matchups →|All GPT-4.5 Orion matchups →
GPT-4.5 Orion vs OpenAI: o1 (previous gpt-flagship)GPT-4.5 Orion vs GPT-5 (next gpt-flagship)Gemini 3 Pro vs GPT-4.5 OrionGemini 3 Flash vs GPT-4.5 OrionGemini 2.0 Flash Thinking vs GPT-4.5 OrionGPT-5.6 Sol vs GPT-4.5 Orion