Claude Opus 4.8 vs Gemini 3.5 Flash
API pricing, context window and capabilities for Claude Opus 4.8 and Gemini 3.5 Flash, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Opus 4.8 wins on Terminal-Bench and on intelligence. Gemini 3.5 Flash wins on price.
Price
Gemini 3.5 Flash
Terminal-Bench
Claude Opus 4.8
Intelligence
Claude Opus 4.8
Context window
Tied
Key takeaways
who wins on what, from the published numbersClaude Opus 4.8 wins
- Higher max output (128K vs 66K)
- More serving providers (8 vs 7)
Gemini 3.5 Flash wins
- Cheaper input ($5.00 vs $1.50 /1M)
- Cheaper output ($25.00 vs $9.00 /1M)
- Supports audio
Cheaper overall
Gemini 3.5 Flash
$1.50 + $9.00 /1M
Larger context
Tied
More providers
Claude Opus 4.8
8 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Claude Opus 4.8 | Gemini 3.5 Flash | |
|---|---|---|
| Input $/1M | $5.00via Anthropic | $1.50via Google best |
| Output $/1M | $25.00via Anthropic | $9.00via Google best |
| Context window | 1M | 1M |
| Max output | 128K best | 66K |
| Serving providers | 8 best | 7 |
| Date | Released May 28, 2026 | Released May 22, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Opus 4.8 | Gemini 3.5 Flash | |
|---|---|---|
| Intelligence | 41.8 best | 32.6 |
| Terminal-Bench | 85% best | 79% |
| GPQA Diamond | 92% | 92% |
| Output speed | 62 t/s | 197 t/s best |
| Latency (TTFT) | 56.16s | 17.14s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Opus 4.8
via Azure
$50
Gemini 3.5 Flash
via OpenRouter
$17
Capabilities
feature support, side by side| Feature | Claude Opus 4.8 | Gemini 3.5 Flash |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | ✓ |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Opus 4.8 or Gemini 3.5 Flash?
Gemini 3.5 Flash is cheaper for input ($5.00 vs $1.50 per 1M tokens) from Google. Gemini 3.5 Flash is cheaper for output ($25.00 vs $9.00 per 1M tokens) from Google.
What is the context window difference between Claude Opus 4.8 and Gemini 3.5 Flash?
Both Claude Opus 4.8 and Gemini 3.5 Flash have about a 1M-token context window.
How do Claude Opus 4.8 and Gemini 3.5 Flash compare on benchmarks?
On the tracked benchmarks, Claude Opus 4.8 leads on Terminal-Bench, and Claude Opus 4.8 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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