Claude Opus 4.8 vs Gemini 3.5 Flash
Anthropic vs Google — Gemini 3.5 Flash is 70% cheaper on input and 64% cheaper on output, with the same 1M context.
Pricing data verified: Jun 10, 2026
| Specification | Claude Opus 4.8 | Gemini 3.5 Flash |
|---|---|---|
| Input Price (per 1M tokens) | $5.00 | $1.50 |
| Output Price (per 1M tokens) | $25.00 | $9.00 |
| Context Window | 1M tokens | 1M tokens |
| Tier | Premium | Mid |
| Provider | Anthropic | |
| Cost at 1M input + 500K output | $17.50 | $6.00 |
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Which Model for Which Use Case?
Cost Optimization
Gemini 3.5 Flash at $1.50/M input is 70% cheaper than Opus 4.8. For high-volume workloads, Gemini delivers massive savings.
Maximum Quality
Opus 4.8 is Anthropic's most capable model, offering the highest quality reasoning and safety. For applications where output quality is paramount, Opus 4.8 justifies its premium.
Google Ecosystem
Gemini 3.5 Flash integrates seamlessly with Google Cloud, Vertex AI, and Google's broader ecosystem. If your stack is Google-first, Gemini is the natural choice.
Safety-Conscious Apps
Anthropic's Opus 4.8 is built with safety as a core priority. For applications handling sensitive data, Opus 4.8's safety features are worth the premium.
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Frequently Asked Questions
Is Gemini 3.5 Flash cheaper than Claude Opus 4.8?
Yes. Gemini 3.5 Flash costs $1.50/M input and $9.00/M output. Claude Opus 4.8 costs $5.00/M input and $25.00/M output. Gemini is 70% cheaper on input and 64% cheaper on output. For 1M input + 500K output/month, Gemini costs $6.00 vs Opus's $17.50 — saving $11.50/month (66%).
Which has a larger context window?
Both models offer a 1M token context window. Neither has an advantage in context size — the choice comes down to cost, quality, and provider ecosystem.
When should I choose Claude Opus 4.8 over Gemini 3.5 Flash?
Choose Opus 4.8 when: (1) you need Anthropic's safety-focused approach, (2) you want the highest quality reasoning, (3) your workload requires careful content handling. Choose Gemini 3.5 Flash when: (1) cost matters (64-70% cheaper), (2) you want Google's ecosystem, (3) your workload fits Gemini's capabilities.
Are both models production-ready?
Both support production workloads. Opus 4.8 is Anthropic's premium model with enterprise support. Gemini 3.5 Flash is Google's mid-tier model offering excellent value with 1M context at budget pricing.