gemini-2.5-flash vs claude-sonnet-4-5
Side-by-side comparison of gemini-2.5-flash and claude-sonnet-4-5 — benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. claude-sonnet-4-5 outperforms gemini-2.5-flash on 9 of 9 shared benchmarks.
gemini-2.5-flash
Input / 1M
$0.30
Output / 1M
$2.50
Context
1.0M
Model ID
google/gemini-2.5-flash
claude-sonnet-4-5
Input / 1M
$3.00
Output / 1M
$15.00
Context
1M
Model ID
anthropic/claude-sonnet-4-5
Benchmark comparison
MMLU Proknowledge
gemini-2.5-flash78.4%
claude-sonnet-4-583.8%
GPQA Diamondreasoning
gemini-2.5-flash68.3%
claude-sonnet-4-574.2%
HumanEvalcoding
gemini-2.5-flash88.5%
claude-sonnet-4-592.0%
SWE-Bench Verifiedcoding
gemini-2.5-flash53.2%
claude-sonnet-4-570.8%
MATHmath
gemini-2.5-flash85.3%
claude-sonnet-4-587.5%
AIME 2024math
gemini-2.5-flash72.1%
claude-sonnet-4-576.1%
MMMUmultimodal
gemini-2.5-flash72.5%
claude-sonnet-4-573.1%
LiveBenchreasoning
gemini-2.5-flash64.2%
claude-sonnet-4-569.5%
τ-bench Retailagentic
gemini-2.5-flash61.5%
claude-sonnet-4-567.3%
Scores sourced from official model cards, Artificial Analysis, and public leaderboards. Benchmarks measure specific skills and don't capture every aspect of model quality.
Pricing & specifications
| gemini-2.5-flash | claude-sonnet-4-5 | |
|---|---|---|
| Input price / 1M | $0.30 | $3.00 |
| Output price / 1M | $2.50 | $15.00 |
| Context window | 1.0M tokens | 1M tokens |
| Max output | 66K tokens | 64K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Prompt caching | Yes | Yes |
| Computer use | — | Yes |
| Provider | Google LLC (Gemini API) | Anthropic PBC |
Questions people ask
Is gemini-2.5-flash better than claude-sonnet-4-5?
claude-sonnet-4-5 outperforms gemini-2.5-flash on 9 of 9 shared benchmarks. See the benchmark comparison above for specifics — gemini-2.5-flash and claude-sonnet-4-5 have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper — gemini-2.5-flash or claude-sonnet-4-5?
gemini-2.5-flash is cheaper. gemini-2.5-flash costs $0.30/$2.50 per 1M input/output tokens, while claude-sonnet-4-5 costs $3.00/$15.00.
Can I use gemini-2.5-flash and claude-sonnet-4-5 through the same API?
Yes. Requesty provides a single OpenAI-compatible API that routes to both. Change just the "model" parameter to switch — "google/gemini-2.5-flash" or "anthropic/claude-sonnet-4-5" — no other code changes needed.
What are the context windows?
gemini-2.5-flash supports up to 1.0M tokens of context. claude-sonnet-4-5 supports up to 1M tokens. Longer context means you can feed larger documents or codebases in a single prompt, though quality often degrades past 128K for most models.
Switch between gemini-2.5-flash and claude-sonnet-4-5 with one line of code
Requesty provides a single OpenAI-compatible API for 400+ models. Change the model parameter, not your code.
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