Claude Haiku 5.5

Claude Haiku 5.5 is Anthropic's fastest and cheapest Claude, built for high-volume, latency-sensitive work such as classification, routing, extraction and subagent tasks.

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input · usd / 1m tok

$0.10

output · usd / 1m tok

$0.50

context window

1mtokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $0.10over 100k · $0.50
output: $0.50over 100k · $2.50
cache read: $0.01over 100k · $0.05
cache write · default ttl: $0.125over 100k · $0.625
cache write · 1h ttl: $0.20over 100k · $1.00

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.

providers

Different companies host Claude Haiku 5.5. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

Azure AI Foundry
Anthropic

specifications

takes text and image in, gives text outanthropic/claude-haiku-5-5

creatorAnthropic
model typeText generation
context window1,000,000 tokens
maximum outputnot published
input
takes text and image in, gives text out
outputtext
tool callingnot verified
releasedoct 7, 2026
endpoint/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.

try it · your prompt, this model, live

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="anthropic/claude-haiku-5-5",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="anthropic/claude-haiku-5-5",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

intelligence index

43.4#19 of 105 models on the gateway

Intelligence Index43.40
legal index (API)42.3
economics index (API)51.2
engineering index (API)44.9
intelligence index (API)43.4
strategy and ops index (API)40.4
finance and accounting index (API)43.9
healthcare and medical index (API)44.1

view source ↗all source data and breakdowns (json) ↗

each configuration is listed separately; these evaluations describe the tested model configuration, and performance and costs can differ on impossibl. unmeasured scores are omitted and api values keep their source units. last checked 2026-10-14.

compare Claude Haiku 5.5 with other models

frontier labs and open weights, best-ranked firstusd / 1m tok · in / out

openai/gpt-6-astra$10.00 / $50.00compare →
google/gemini-4-argon$2.00 / $10.00compare →
meta/muse-wonder$4.00 / $20.00compare →
xiaomi/mimo-v2.6-pro$0.435 / $0.87compare →

impossibl models --all →

frequently asked questions

What is Claude Haiku 5.5?

Claude Haiku 5.5 is Anthropic's fastest and cheapest Claude, built for high-volume, latency-sensitive work such as classification, routing, extraction and subagent tasks. Unlike Haiku 4.5 it thinks adaptively by default and is steered with the effort parameter, so the same model covers quick lookups and work that needs a moment's reasoning.

How much does Claude Haiku 5.5 cost?

Claude Haiku 5.5 costs $0.10 per million input tokens and $0.50 per million output tokens through the Impossibl API. Cache reads cost $0.01 per million tokens; cache writes cost $0.125 per million tokens; cache writes with one-hour retention cost $0.20 per million tokens. These base rates apply through 100,000 total input tokens per request. Above 100,000 input tokens, the long-context rates in the pricing table apply to the whole request. All rates are in USD.

view the pricing table ↑

What is the context length of Claude Haiku 5.5?

Claude Haiku 5.5 has a 1,000,000-token context window through the Impossibl API.

What inputs and outputs does Claude Haiku 5.5 support?

Claude Haiku 5.5 accepts text and image as input. Claude Haiku 5.5 returns text.

How do I use Claude Haiku 5.5 through an API?

Claude Haiku 5.5 is available through the Impossibl API. Use anthropic/claude-haiku-5-5 as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

follow the api quickstart →

When was Claude Haiku 5.5 released?

Anthropic released Claude Haiku 5.5 on October 7, 2026.

Creator release announcement ↗

this page describes Claude Haiku 5.5 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. model descriptions and release dates, where available, use the creator sources linked under the answers above.

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