claude-sonnet-4-5 vs gemini-2.5-flash
Side-by-side comparison of claude-sonnet-4-5 and gemini-2.5-flash— benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API.
claude-sonnet-4-5
Input / 1M
$3.00
Output / 1M
$15.00
Context
1M
Model ID
anthropic/claude-sonnet-4-5
gemini-2.5-flash
Input / 1M
$0.30
Output / 1M
$2.50
Context
1.0M
Model ID
google/gemini-2.5-flash
Benchmark comparison
Intelligence Indexreasoning
claude-sonnet-4-5—
gemini-2.5-flash27.0%
Coding Indexcoding
claude-sonnet-4-5—
gemini-2.5-flash22.2%
Math Indexmath
claude-sonnet-4-5—
gemini-2.5-flash73.3%
GPQA Diamondreasoning
claude-sonnet-4-5—
gemini-2.5-flash79.0%
AIME 2025math
claude-sonnet-4-5—
gemini-2.5-flash73.3%
LiveCodeBenchcoding
claude-sonnet-4-5—
gemini-2.5-flash69.5%
Terminal-Bench Hardagentic
claude-sonnet-4-5—
gemini-2.5-flash13.6%
τ²-Benchagentic
claude-sonnet-4-5—
gemini-2.5-flash31.6%
SciCodecoding
claude-sonnet-4-5—
gemini-2.5-flash39.4%
MMLU Proknowledge
claude-sonnet-4-5—
gemini-2.5-flash83.2%
Humanity's Last Examreasoning
claude-sonnet-4-5—
gemini-2.5-flash11.1%
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
| claude-sonnet-4-5 | gemini-2.5-flash | |
|---|---|---|
| Input price / 1M | $3.00 | $0.30 |
| Output price / 1M | $15.00 | $2.50 |
| Context window | 1M tokens | 1.0M tokens |
| Max output | 64K tokens | 66K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Prompt caching | Yes | Yes |
| Computer use | Yes | — |
| Provider | Anthropic PBC | Google LLC (Gemini API) |
Questions people ask
Is claude-sonnet-4-5 better than gemini-2.5-flash?
Benchmark data is limited for one or both models. Compare pricing and capabilities in the tables above, and test both on your own workload.
Which is cheaper — claude-sonnet-4-5 or gemini-2.5-flash?
gemini-2.5-flash is cheaper. claude-sonnet-4-5 costs $3.00/$15.00 per 1M input/output tokens, while gemini-2.5-flash costs $0.30/$2.50.
Can I use claude-sonnet-4-5 and gemini-2.5-flash through the same API?
Yes. Requesty provides a single OpenAI-compatible API that routes to both. Change just the "model" parameter to switch — "anthropic/claude-sonnet-4-5" or "google/gemini-2.5-flash" — no other code changes needed.
What are the context windows?
claude-sonnet-4-5 supports up to 1M tokens of context. gemini-2.5-flash supports up to 1.0M 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 claude-sonnet-4-5 and gemini-2.5-flash 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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