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Claude Sonnet 5 vs Opus 4.8
Same provider, different tiers. Sonnet 5 at $3/$15 offers 40% savings over Opus 4.8 at $5/$25 — with identical 1M context and 128K output. Is Opus's premium quality worth the extra cost?
Pricing data verified: Jul 1, 2026
| Specification | Claude Sonnet 5 (Anthropic) | Claude Opus 4.8 (Anthropic) |
|---|---|---|
| Input Price (per 1M tokens) | $3.00 | $5.00 |
| Output Price (per 1M tokens) | $15.00 | $25.00 |
| Context Window | 1M tokens | 1M tokens |
| Max Output | 128K tokens | 128K tokens |
| Tier | Mid | Premium |
| Provider | Anthropic | Anthropic |
Calculate Your Exact Costs
See how much you can save with Sonnet 5 — or whether Opus 4.8's premium quality justifies the 40% higher cost.
Other Anthropic Models
Which Model for Which Use Case?
Complex Reasoning
Multi-step analysis, research synthesis, nuanced decision-making. Opus 4.8 at $5/$25 is Anthropic's most capable model for complex reasoning. Sonnet 5 at $3/$15 delivers excellent quality at 40% lower cost for most reasoning tasks.
Agentic Coding
High-autonomy coding tasks, complex codebases, multi-file refactoring. Opus 4.8 at $5/$25 is optimized for agentic work with high autonomy. Sonnet 5 at $3/$15 handles most coding tasks well but may need more guidance on complex architecture.
Content Generation
Blog posts, documentation, marketing copy. Both models produce excellent content. Sonnet 5 at $3/$15 is 40% cheaper on output, making it the better value for content-heavy workloads.
High-Volume Batch Processing
At scale, the 40% cost difference adds up. 10M input + 5M output tokens/month costs $105 with Sonnet 5 vs $175 with Opus 4.8 — saving $70/month. For batch workloads, Sonnet 5 is the clear winner.
Choosing between Anthropic models?
APIpulse Pro lets you compare all 49 models including Sonnet 5 ($3/$15) and Opus 4.8 ($5/$25), save scenarios, and export cost reports for your team.
Frequently Asked Questions
How much cheaper is Claude Sonnet 5?
Sonnet 5 costs $3/$15 per 1M tokens vs Opus 4.8 at $5/$25 — 40% cheaper on both input and output. At 1M input + 500K output tokens/month, that's $10.50 vs $17.50, saving $7/month. At 10M input + 5M output, savings reach $70/month.
Is Opus 4.8 worth the extra cost?
Opus 4.8 at $5/$25 is Anthropic's most capable model for complex reasoning and agentic coding. For the most demanding tasks, the 40% premium may justify itself in quality. For most production workloads, Sonnet 5 at $3/$15 offers excellent value with comparable quality.
Do they have the same context window?
Yes. Both Sonnet 5 and Opus 4.8 support 1M token context windows and 128K max output tokens. The capabilities are identical — the difference is in model quality and pricing.
When should I use Sonnet 5 over Opus 4.8?
Choose Sonnet 5 ($3/$15) for most production workloads: code generation, content creation, data processing, chatbots. Choose Opus 4.8 ($5/$25) for complex reasoning, agentic coding with high autonomy, and tasks where absolute peak quality justifies 40% higher cost.
Does Sonnet 5 have introductory pricing?
Yes. Claude Sonnet 5 offers introductory pricing of $2/$10 per MTok through August 31, 2026 — 50% cheaper than Opus 4.8's standard pricing. After August 31, Sonnet 5 returns to $3/$15.
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