How much does Claude Opus 5.5 cost?

Claude Opus 5.5 costs $4 per 1 million input tokens and $20 per 1 million output tokens. This pricing is set by Anthropic.

What tokenizer does Claude Opus 5.5 use?

Claude Opus 5.5 uses the cl100k_base tokenizer. This tokenizer has a vocabulary of ~100,000 tokens and is widely used across many models.

What is Claude Opus 5.5's context window?

Claude Opus 5.5 supports a context window of 1.0M tokens (1,000,000 tokens). The maximum output length is 128K tokens.

How does Claude Opus 5.5 compare to other models?

You can compare Claude Opus 5.5's pricing and capabilities against other LLMs in the comparison table above, or visit the full pricing page for a side-by-side view of all models.

How do I count tokens for Claude Opus 5.5?

Use the token counter at the top of this page or visit the homepage calculator. Paste your text and it will show the exact token count and cost for Claude Opus 5.5 using the cl100k_base tokenizer.

Claude Opus 5.5

Last verified September 28, 2026 · Anthropic pricing ↗

$4.00/1M input · $20.00/1M output · 1.0M context · Anthropic

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Alternatives to Claude Opus 5.5

Cheaper Alternative

Gemini 3.1 Flash TTS

$1.00 in · $20.00 out · Google

13% cheaper

Premium Upgrade

Gemini 3.1 Flash Lite Image

$0.250 in · $30.00 out · Google

Premium tier from Google

Same Provider

Claude Opus 5

$5.00 in · $25.00 out · Anthropic

Higher tier in Anthropic ecosystem

Pricing Details

AnthropicLaunched September 22, 2026. Card: $4.00 input, $5.00 5-minute cache write, $8.00 1-hour cache write, $0.20 cache hit, $20.00 output. 20% under Opus 5 on input, output and both cache writes; the cache hit is 60% under Opus 5's $0.50 because Anthropic prices Opus 5.5 cache hits and refreshes at 0.05x base input, against 0.1x on most Claude models and 0.025x on Fable 5.1 and Mythos 5.1. Batch $2.00/$10.00, which is GPT-6 Sol's Standard card. Fast mode $8.00/$40.00, first-party API only, not with Batch. Full 1M context at standard pricing, no long-context tier. inference_geo 'us' is 1.1x; Bedrock and Google Cloud regional endpoints +10%. Max output 128K (300K on Batch with the output-300k-2026-03-24 beta header). Adaptive thinking always on; effort low/medium/high/xhigh/max, default MEDIUM where Opus 5 defaulted to high, which is how Anthropic's '40% less than Opus 5 on typical workloads' is scoped ('at default settings'). Same tokenizer as Opus 5. Knowledge cutoff June 2026. Available on Claude API, Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS. Anthropic-reported (max effort): Terminal-Bench 4.0 66.4 (Opus 5 52.3, GPT-6 Astra 57.9), CursorBench 4.0 57.8, OSWorld 2.0 81.8, GDPval-AA v2.1 1846 Elo, HLE with tools 67.7. Artificial Analysis Intelligence Index v4.3.2 (read 2026-09-28): max 58 at $5.98 per task and $8,708 to run the index (119k output tokens per task, 682.71s TTFT); xhigh 56 / $3.46; high 54 / $1.82; medium 51 / $1.34; low 42 / $0.55. At max effort it costs more per task than Opus 5 max ($5.86) despite the cheaper card, because it spent 260M output tokens on the index against 140M. API ID: claude-opus-5-5.

Input / 1M tokens

Output / 1M tokens

$20

Context Window

1.0M

Max Output

128K

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Price History

Launched at current price on 2026-09-22. No price changes recorded since.

Frequently Asked Questions

Common questions about Claude Opus 5.5 pricing and usage