What is the cost difference at scale between Opus 4.8 and Sonnet 5?

At 1M input + 500K output tokens/month: Opus 4.8 costs $17.50 vs Sonnet 5's $10.50 ($7/month difference). At 10M input + 5M output: Opus 4.8 costs $175 vs Sonnet 5's $105 ($70/month difference). At 100M input + 50M output: Opus 4.8 costs $1,750 vs Sonnet 5's $1,050 — saving $700/month with Sonnet 5. The 67% gap compounds fast at scale.

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Premium Mid

Claude Opus 4.8 vs Sonnet 5

Q: How much more expensive is Claude Opus 4.8 than Sonnet 5?

Claude Opus 4.8 costs $5/$25 per 1M tokens while Sonnet 5 costs $3/$15 per 1M tokens. Opus 4.8 is 67% more expensive on both input and output. For a typical workload of 1M input + 500K output tokens/month, Opus 4.8 costs $17.50 vs Sonnet 5's $10.50 — a difference of $7/month. At 10M input + 5M output, the gap widens to $70/month.

Q: Is Opus 4.8 worth the extra cost over Sonnet 5?

Opus 4.8 at $5/$25 is Anthropic's most capable model — best for complex reasoning, multi-step agentic tasks, and nuanced analysis where quality is non-negotiable. Sonnet 5 at $3/$15 is the value play, delivering excellent performance for 67% less. Both share the same 1M context window. Choose Opus when the output quality directly impacts revenue or safety; choose Sonnet 5 for high-volume or cost-sensitive workloads.

Q: Do Opus 4.8 and Sonnet 5 have the same context window?

Yes. Both Claude Opus 4.8 and Sonnet 5 offer a 1M token context window. This means context window is not a deciding factor between the two — the choice comes down to output quality vs cost. If you need long-context processing, either model handles it equally well.

Anthropic's internal showdown: premium flagship vs mid-tier value. Same 1M context window, same provider — but 67% price gap. When is Opus 4.8 worth the upgrade over Sonnet 5?

Pricing data verified: Jul 3, 2026

Specification	Claude Opus 4.8 (Anthropic)	Claude Sonnet 5 (Anthropic)
Input Price (per 1M tokens)	$5.00	$3.00
Output Price (per 1M tokens)	$25.00	$15.00
Context Window	1M tokens	1M tokens
Tier	Premium	Mid
Provider	Anthropic	Anthropic
Best For	Complex reasoning, agentic tasks	High-volume, cost-sensitive workloads

Calculate Your Exact Costs

See the real cost difference between Opus 4.8 and Sonnet 5 for your specific usage pattern.

Input Tokens per Request

Output Tokens per Request

Requests per Day

Days per Month

Anthropic

Claude Opus 4.8

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Anthropic

Claude Sonnet 5

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Other Premium and Mid-Tier Models

GPT-5.5

OpenAI

$5 / $30 per 1M

1.05M context

Gemini 3.1 Pro

Google

$2.00 / $12 per 1M

1M context

DeepSeek V4 Pro

DeepSeek

$1.00 / $4 per 1M

256K context

When to Upgrade from Sonnet 5 to Opus 4.8

Complex Reasoning and Research

Multi-step analysis, research synthesis, and tasks requiring deep reasoning chains. Opus 4.8 at $5/$25 excels at breaking down complex problems with higher accuracy. Sonnet 5 at $3/$15 handles most reasoning well, but Opus has a measurable edge on edge cases.

Peak quality: Opus 4.8 | Good enough: Sonnet 5

Code Generation and Review

Both models handle code well with 1M context. Opus 4.8 produces fewer bugs on complex architectures and nuanced refactors. Sonnet 5 is excellent for routine code generation, completions, and documentation — at 67% less cost.

Daily coding: Sonnet 5 | Architecture: Opus 4.8

High-Volume Batch Processing

At scale, the 67% cost difference is dramatic. 10M input + 5M output tokens/month costs $175 with Opus 4.8 vs $105 with Sonnet 5 — saving $70/month. For batch workloads where output quality variance is acceptable, Sonnet 5 is the clear winner.

Better value: Sonnet 5

Agentic Workflows

Multi-step autonomous tasks requiring tool use, planning, and self-correction. Opus 4.8's superior reasoning reduces error rates in agentic loops, saving tokens on retries. Sonnet 5 works for simpler agents, but complex agentic workflows benefit from Opus's depth.

Complex agents: Opus 4.8 | Simple agents: Sonnet 5

Choosing between Anthropic models?

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Frequently Asked Questions

How much more expensive is Claude Opus 4.8 than Sonnet 5?

Opus 4.8 costs $5/$25 per 1M tokens vs Sonnet 5's $3/$15 — 67% more expensive on both input and output. At 1M input + 500K output tokens/month, that's $17.50 vs $10.50, a $7/month difference. At 10M input + 5M output, the gap widens to $70/month.

Is Opus 4.8 worth the extra cost over Sonnet 5?

Opus 4.8 is Anthropic's most capable model — best for complex reasoning, agentic workflows, and safety-critical outputs. Sonnet 5 delivers excellent performance for 67% less. Both share the same 1M context window. Choose Opus when output quality directly impacts revenue or safety; choose Sonnet 5 for high-volume or cost-sensitive workloads.

Do Opus 4.8 and Sonnet 5 have the same context window?

Yes. Both offer a 1M token context window. Context window is not a deciding factor between these two models — the choice comes down to output quality vs cost. If you need long-context processing, either model handles it equally well.

When should I choose Sonnet 5 over Opus 4.8?

Choose Sonnet 5 ($3/$15) for high-volume workloads like batch processing, content generation, code completion, and chatbot traffic where 67% savings add up quickly. Choose Opus 4.8 ($5/$25) when you need absolute peak quality: complex research, agentic workflows, safety-critical outputs, or tasks where a single mistake is costly.

What is the annual cost difference at scale?

At 10M input + 5M output tokens/month: Opus 4.8 costs $175/month ($2,100/year) vs Sonnet 5's $105/month ($1,260/year) — saving $840/year by choosing Sonnet 5. At 100M input + 50M output: Opus 4.8 costs $21,000/year vs Sonnet 5's $12,600/year — an $8,400/year difference.