anthropic/claude-opus-5-5
estimated usage cost
$14.00
1,000 requests × (1,000 uncached input × $4.00 + 500 output × $20.00) / 1,000,000 = $14.00
base rates; no context pricing tiers are published.
Claude Opus 5.5 vs Grok 4.20 (multi-agent)
rates, context and capabilities side by side on the impossibl api, and what the same workload costs on each.
| specification | Claude Opus 5.5 anthropic/claude-opus-5-5 | Grok 4.20 (multi-agent) xai/grok-4.20-multi-agent-0309 |
|---|---|---|
| input · usd / 1m tok | $4.00 | $1.25 |
| output · usd / 1m tok | $20.00 | $2.50 |
| context window | 1mtokens | 1mtokens |
| modalities · in → out | takes text and image in, gives text out | takes text and image in, gives text out |
pricing
| base api rates · usd per 1m tokens | Claude Opus 5.5 anthropic/claude-opus-5-5 | Grok 4.20 (multi-agent) xai/grok-4.20-multi-agent-0309 |
|---|---|---|
| input | $4.00 | $1.25over 200k · $2.50 |
| output | $20.00 | $2.50over 200k · $5.00 |
| cache read | $0.20 | $0.20over 200k · $0.40 |
| cache write · default ttl | $5.00 | not published |
| cache write · 1h ttl | $8.00 | not published |
brackets are by input tokens per request: a request over a threshold is billed at that bracket's rates for all of its tokens. cache creation can have a separate charge. the estimate below prices one workload at these rates on every model.
specifications
| as published | Claude Opus 5.5 anthropic/claude-opus-5-5 | Grok 4.20 (multi-agent) xai/grok-4.20-multi-agent-0309 |
|---|---|---|
| creator | Anthropic | xAI |
| model type | Text generation | Text generation |
| context window | 1,000,000tokens | 1,000,000tokens |
| input | takes text and image in, gives text out | takes text and image in, gives text out |
| output | text | text |
| tool calling | not verified | not verified |
| released | sep 22, 2026 | mar 10, 2026 |
| endpoint | /v1/chat/completions | /v1/chat/completions |
unknown means the public catalog does not establish that fact. a model's documented capabilities can differ from what a particular api supports. see the model documentation for integration details.
estimate your cost
one token workload, priced on every model at the published rates, in usd. change the numbers to match yours.
xai/grok-4.20-multi-agent-0309
estimated usage cost
$2.50
1,000 requests × (1,000 uncached input × $1.25 + 500 output × $2.50) / 1,000,000 = $2.50
base rates: up to 200,000 input tokens per request, inclusive.
estimates use published impossibl api usage rates. configured billing adjustments, funding fees, taxes, and custom workspace rates are excluded and may change the final amount.
image and audio usage, cache creation, and additional tool charges are excluded. reasoning tokens count as billable output, even when they are not visible in the response.
summary
Claude Opus 5.5 and Grok 4.20 (multi-agent) are available through the Impossibl API. they share the /v1/chat/completions endpoint; the model identifier selects the model for a request.
Claude Opus 5.5 is created by Anthropic. It has a 1,000,000-token context window. Base API pricing (USD): $4.00 per million input tokens; $20.00 per million output tokens.
Grok 4.20 (multi-agent) is created by xAI. It has a 1,000,000-token context window. Base API pricing (USD): $1.25 per million input tokens; $2.50 per million output tokens. Above 200,000 input tokens per request, context-tier rates apply to the whole request.
Claude Opus 5.5 →Grok 4.20 (multi-agent) →
this page compares Claude Opus 5.5 vs Grok 4.20 (multi-agent) as listed by the impossibl public api. prices and availability come from that catalog, refreshed here every five minutes. this is an impossibl offering, not a comparison of independent hosting-provider quotes.
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