Which model is better: Claude 4.5 Sonnet or Gemini 2.5 Flash?
Gemini 2.5 Flash is 90.0% cheaper for input tokens ($0.30 vs. $3.00 per 1M tokens) and $2.50 vs. $15.00 for output tokens (10.0x cost advantage). In terms of operational performance, Gemini 2.5 Flash delivers lower response latency at 110ms TTFT (270ms faster than Claude 4.5 Sonnet) with 180 vs. 84 tok/s throughput. Claude 4.5 Sonnet leads coding evaluations at 75.8% SWE-bench Verified vs. 58.0% for Gemini 2.5 Flash and 84.2% vs. 70.5% on GPQA Diamond.
Verified daily via automated API latency tests and official documentation.
Zero-Shot RAG Verified
Verified Performance & Unit Economics Delta (12 Dimensions)
Daily synchronized metrics across token pricing, prompt cache economics, latency, throughput, and 5 capability benchmarks.
Metric / Dimension
Claude 4.5 Sonnet
Gemini 2.5 Flash
Net Delta / Advantage
Input Cost / 1M Tokens
$3.00
$0.30
Gemini 2.5 Flash is 10.0x cheaper
Output Cost / 1M Tokens
$15.00
$2.50
Gemini 2.5 Flash (83.3% lower)
Prompt Cache Read / 1M
$0.300
$0.030
Gemini 2.5 Flash is 10.0x cheaper
Prompt Cache Write / 1M
$3.75
$0.30
Gemini 2.5 Flash is 12.5x cheaper
Context Window (Max Output)
205k (64k out)
1,049k (66k out)
Gemini 2.5 Flash (5.1x larger context)
Avg TTFT Response Latency
380ms
110ms
Gemini 2.5 Flash (270ms faster)
Generation Speed (Throughput)
84 tok/s
180 tok/s
Gemini 2.5 Flash (+96 tok/s faster)
SWE-bench Verified (Coding)
75.8%
58%
Claude 4.5 Sonnet (+17.8% lead)
GPQA Diamond (PhD STEM)
84.2%
70.5%
Claude 4.5 Sonnet (+13.7% lead)
MMLU-Pro (Multi-Discipline)
90.4%
82%
Claude 4.5 Sonnet (+8.4% lead)
MATH-500 (Quantitative Logic)
97.5%
89%
Claude 4.5 Sonnet (+8.5% lead)
Inference Value Score (IVR)
56.5 / 100
66.6 / 100
Gemini 2.5 Flash (+10.1 pts)
Interactive Monthly Token Economics & ROI Forecaster
Model production workloads across prompt, completion, and cached context tokens, or switch models on the fly.
Which is cheaper: Claude 4.5 Sonnet or Gemini 2.5 Flash?
Gemini 2.5 Flash is cheaper at $0.30/1M input tokens ($2.50/1M output) compared to $3.00/1M input ($15.00/1M output) for Claude 4.5 Sonnet.
Which model has lower TTFT latency and higher tok/s throughput: Claude 4.5 Sonnet or Gemini 2.5 Flash?
Gemini 2.5 Flash delivers faster first-token latency at 110ms TTFT (180 tok/s throughput) compared to 380ms TTFT (84 tok/s) for Claude 4.5 Sonnet.
How do Claude 4.5 Sonnet and Gemini 2.5 Flash compare on SWE-bench coding and GPQA Diamond reasoning?
On SWE-bench Verified software engineering, Claude 4.5 Sonnet scores 75.8% versus 58% for Gemini 2.5 Flash. On GPQA Diamond graduate-level STEM reasoning, Claude 4.5 Sonnet scores 84.2% versus 70.5% for Gemini 2.5 Flash (and 97.5% vs 89% on MATH-500).
When should you choose Claude 4.5 Sonnet?
Choose Claude 4.5 Sonnet (Anthropic) for end-to-end autonomous coding agents, complex multi-file debugging, browser/GUI automation, and high-precision technical writing — offering a 204k context window, 380ms TTFT, and $3.00/1M input pricing ($0.300/1M cached reads).
When should you choose Gemini 2.5 Flash?
Choose Gemini 2.5 Flash (Google) for cost-efficient 1M-context summarization, multimodal extraction, and interactive assistants — offering a 1,048k context window, 110ms TTFT, and $0.30/1M input pricing ($0.030/1M cached reads).
