Home › Compare › Anthropic: Claude Opus 5.5 vs Pareto 26.9
Anthropic: Claude Opus 5.5 vs Pareto 26.9: API Pricing Compared
Comparing Anthropic: Claude Opus 5.5 and Pareto 26.9: on combined input+output list price, Pareto 26.9 is cheaper at $10 vs $24 per 1M tokens — a difference of $14 (58%). Anthropic: Claude Opus 5.5 costs $4 in / $20 out with a 1,000,000-token context; Pareto 26.9 costs $2.5 in / $7.5 out with a 262,144-token context.
| Anthropic: Claude Opus 5.5 | Pareto 26.9 | |
|---|---|---|
| Input /1M | $4 | $2.5 |
| Output /1M | $20 | $7.5 |
| Cached input /1M | $0.2 | $0.25 |
| Context window | 1,000,000 | 262,144 |
| Max output tokens | 128,000 | 131,072 |
| Cost @ 10M in + 2M out / mo | $80 | $40 |
Estimate your own workload in the cost calculator, or open the full pages for Anthropic: Claude Opus 5.5 and Pareto 26.9.
Frequently asked questions
Which is cheaper, Anthropic: Claude Opus 5.5 or Pareto 26.9?
Pareto 26.9 is cheaper on combined list price: $10 vs $24 per 1M tokens (input + output). At 10M input + 2M output tokens per month, Anthropic: Claude Opus 5.5 costs $80 and Pareto 26.9 costs $40.
Which has the larger context window, Anthropic: Claude Opus 5.5 or Pareto 26.9?
Anthropic: Claude Opus 5.5 has a context window of 1,000,000 tokens; Pareto 26.9 has 262,144 tokens. The larger one is Anthropic: Claude Opus 5.5.
Price snapshot October 21, 2026, refreshed daily.