Claude Opus 5 vs Claude Opus 5.5: pricing and benchmarks
Claude Opus 5.5 is 20% cheaper on input tokens ($4.00 vs $5.00 per 1M). Claude Opus 5.5 is 20% cheaper on output tokens ($20.00 vs $25.00 per 1M). On our document Q&A workload (50,000 questions a month), Claude Opus 5.5 costs $2,200 a month versus $2,750 for Claude Opus 5, 20% less. Roughly tied. Claude Opus 5 scores 162.6 and Claude Opus 5.5 scores 166.8 on the Epoch Capabilities Index, and their confidence intervals overlap.
Which should you choose?
Roughly tied. Claude Opus 5 scores 162.6 and Claude Opus 5.5 scores 166.8 on the Epoch Capabilities Index, and their confidence intervals overlap.
Claude Opus 5.5 scores 91.2% on FrontierMath (Tiers 1–3) vs 85.6% for Claude Opus 5.
Claude Opus 5.5 costs $8.00 per 1M tokens (3:1 input-to-output mix) vs $10.00 for Claude Opus 5, 20% less.
Claude Opus 5.5 delivers equal or higher overall capability for 20% less.
Pricing and specs
| Claude Opus 5 | Claude Opus 5.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| API model ID | claude-opus-5 | claude-opus-5-5 |
| Input / 1M tokens | $5.00 | $4.00 |
| Cached input / 1M tokens | $0.50 | $0.20 |
| Output / 1M tokens | $25.00 | $20.00 |
| Long-context rates | — | — |
| Context window | 1M tokens | 1M tokens |
| Max output | 128K tokens | 128K tokens |
| Batch discount | 50% off | 50% off |
Benchmarks
| Claude Opus 5 | Claude Opus 5.5 | |
|---|---|---|
| Epoch Capabilities Index | 162.6 | 166.8 |
| GPQA Diamond· Science reasoning | 93.9% | 90.6% |
| FrontierMath (Tiers 1–3)· Advanced math | 85.6% | 91.2% |
| SimpleQA Verified· Factual accuracy | 59.9% | 72.2% |
| ARC-AGI-2· Abstract reasoning | 90.4% | 93.3% |
| DeepSWE· Coding | 73.6% | — |
| APEX-Agents· Agentic work | 65.8% | 73.5% |
Source: Epoch AI, best recorded result per model (CC BY 4.0). A dash means no published score. See all benchmarks
Monthly cost for real workloads
| Workload | Claude Opus 5 | Claude Opus 5.5 | Difference |
|---|---|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $1,750 | $1,400 | Claude Opus 5.5 20% cheaper |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $2,750 | $2,200 | Claude Opus 5.5 20% cheaper |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $1,240 | $936.00 | Claude Opus 5.5 25% cheaper |
Cached chatbot The same 100,000-reply support chatbot, but 60% of each prompt (system prompt + conversation history) is served from the prompt cache. | $1,345 | $1,058 | Claude Opus 5.5 21% cheaper |
Meeting notes 10,000 meetings a month summarized from ~12,000-token transcripts, ~1,000 output tokens each. | $850.00 | $680.00 | Claude Opus 5.5 20% cheaper |
Bulk translation 200,000 short translations a month, ~800 input and ~800 output tokens each. | $4,800 | $3,840 | Claude Opus 5.5 20% cheaper |
Content moderation 1,000,000 classifications a month, ~400 input tokens and ~80 output tokens each. | $4,000 | $3,200 | Claude Opus 5.5 20% cheaper |
Article drafting 300 long-form articles a month written from a ~4,000-token brief and outline, ~5,000 output tokens each. | $43.50 | $34.80 | Claude Opus 5.5 20% cheaper |
Code review bot 30,000 pull-request reviews a month, ~5,000 input tokens each (30% cached repository context) and ~700 output tokens. | $1,073 | $849.00 | Claude Opus 5.5 21% cheaper |
Invoice extraction 100,000 documents a month parsed into structured JSON, ~1,200 input and ~250 output tokens each. | $1,225 | $980.00 | Claude Opus 5.5 20% cheaper |
Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.
Claude Opus 5 vs Claude Opus 5.5 cost calculator
- $2,200/mo$0.04 / req
- Claude Opus 5Anthropic$2,750/mo$0.06 / req
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
Claude Opus 5 pricing notes
Anthropic’s model for complex agentic coding and enterprise work.
- Cache writes cost $6.25 (5-minute cache) or $10 (1-hour cache) per 1M tokens.
- Fast mode (research preview) costs $10 input / $50 output per 1M tokens.
- Uses Anthropic’s newer tokenizer, which produces roughly 30% more tokens for the same text.
- US-only inference (inference_geo: "us") costs 1.1x.
Claude Opus 5.5 pricing notes
Anthropic’s recommended default model for most workloads, with adaptive thinking always on.
- Cache reads cost 5% of the input price, against 10% on Claude Opus 5 and Sonnet 5.
- Cache writes cost $5 (5-minute cache) or $8 (1-hour cache) per 1M tokens.
- Fast mode costs $8 input / $40 output per 1M tokens.
- US-only inference (inference_geo: "us") costs 1.1x.
Frequently asked questions
- Is Claude Opus 5 cheaper than Claude Opus 5.5?
- Claude Opus 5.5 is 20% cheaper on input tokens ($4.00 vs $5.00 per 1M). Claude Opus 5.5 is 20% cheaper on output tokens ($20.00 vs $25.00 per 1M). On our document Q&A workload (50,000 questions a month), Claude Opus 5.5 costs $2,200 a month versus $2,750 for Claude Opus 5, 20% less.
- Which is more capable, Claude Opus 5 or Claude Opus 5.5?
- Roughly tied. Claude Opus 5 scores 162.6 and Claude Opus 5.5 scores 166.8 on the Epoch Capabilities Index, and their confidence intervals overlap.
- How much does Claude Opus 5 cost per 1M tokens?
- Claude Opus 5 costs $5.00 per 1M input tokens and $25.00 per 1M output tokens, and $0.50 per 1M cached input tokens on Anthropic’s standard tier.
- How much does Claude Opus 5.5 cost per 1M tokens?
- Claude Opus 5.5 costs $4.00 per 1M input tokens and $20.00 per 1M output tokens, and $0.20 per 1M cached input tokens on Anthropic’s standard tier.
- Which has the larger context window, Claude Opus 5 or Claude Opus 5.5?
- Both offer a 1M-token context window.