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Claude Opus 4.8 versus Claude Sonnet 5 on price, context, and capabilities. Both are in the Claude group. Costs use a shared reference workload. Prices from Models.dev. Data last refreshed Oct 14, 2026, 05:43 PM UTC.

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Claude Opus 4.8vsClaude Sonnet 5

Alphabetical by model id, so this URL is the one to index. Claude Opus 4.8 is anthropic/claude-opus-4-8. Claude Sonnet 5 is anthropic/claude-sonnet-5. Both are among the models the most providers list, inside the Claude group.

vs

100 requests a day, 2,000 input tokens and 500 output tokens, no cache hits. A light chat workload so the rate cards are comparable.
SpecClaude Opus 4.8Claude Sonnet 5
Monthly, reference workload$67.50$27.00
Input / 1M$5.00$2.00
Output / 1M$25.00$10.00
Cache read / 1M$0.50$0.20
Cache write / 1M$6.25$2.50
Context1,000,0001,000,000
Max output128,000128,000
ReasoningYesYes
Tool callsYesYes
VisionYesYes
Open weightsNoNo
Providers4942
Released2026-05-282026-06-30

Same workload, your numbers

Prices are USD per 1M tokens. A month is 30 days. Cache hits use the cache-read rate when the model has one; otherwise the cache field is ignored.

Claude Opus 4.8 costs $40.50 more per month than Claude Sonnet 5 at these inputs.

monthly = requests/day × 30 × (input tokens × (1 − cache hit) × input price + input tokens × cache hit × cache-read price + output tokens × output price) ÷ 1,000,000