Claude Haiku 4.5
Provider list prices: no platform markup, pay-as-you-go. These are official list prices. Logged-in customers may see effective prices including workspace discounts on /console/pricing. Effective input at a 70% cache-hit rate:$0.37/M. Explicit cache_control breakpoints; cached reads bill at 0.1x the input price, cache writes carry a 1.25x (5-minute TTL) or 2x (1-hour TTL) surcharge; per-model minimum prefix sizes apply.
Use Claude Haiku 4.5 in 30 seconds
OpenAI-compatible: swap the base_url, keep your SDK. POST /v1/chat/completions
from openai import OpenAI
client = OpenAI(
base_url="https://synthorai.io/v1",
api_key="sk-syn-...",
)
resp = client.chat.completions.create(
model="claude-haiku-4-5",
messages=[{"role": "user", "content": "Summarize this diff"}],
)
print(resp.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://synthorai.io/v1",
apiKey: "sk-syn-...",
});
const resp = await client.chat.completions.create({
model: "claude-haiku-4-5",
messages: [{ role: "user", content: "Summarize this diff" }],
});
console.log(resp.choices[0].message.content);curl https://synthorai.io/v1/chat/completions \
-H "Authorization: Bearer sk-syn-..." \
-H "Content-Type: application/json" \
-d '{
"model": "claude-haiku-4-5",
"messages": [{"role": "user", "content": "Hello"}]
}'package main
import (
"context"
"fmt"
"github.com/openai/openai-go/v3"
"github.com/openai/openai-go/v3/option"
)
func main() {
client := openai.NewClient(
option.WithBaseURL("https://synthorai.io/v1"),
option.WithAPIKey("sk-syn-..."),
)
resp, _ := client.Chat.Completions.New(context.TODO(), openai.ChatCompletionNewParams{
Model: "claude-haiku-4-5",
Messages: []openai.ChatCompletionMessageParamUnion{
openai.UserMessage("Summarize this diff"),
},
})
fmt.Println(resp.Choices[0].Message.Content)
}import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.models.chat.completions.*;
OpenAIClient client = OpenAIOkHttpClient.builder()
.baseUrl("https://synthorai.io/v1")
.apiKey("sk-syn-...")
.build();
ChatCompletion resp = client.chat().completions().create(
ChatCompletionCreateParams.builder()
.model("claude-haiku-4-5")
.addUserMessage("Summarize this diff")
.build());
System.out.println(resp.choices().get(0).message().content().orElse(""));About Claude Haiku 4.5
Claude Haiku 4.5 is the speed tier of the current Claude lineup; Anthropic describes it as "the fastest model with near-frontier intelligence." It offers the lowest latency and lowest price of any current Claude model, with a 200K-token context window, up to 64K output tokens, extended thinking support, vision input, tool use, and prompt caching.
- That profile suits high-volume chat, classification, and coding assistants where responsiveness matters most.
- Synthorai serves Claude Haiku 4.5 through its OpenAI-compatible chat endpoint, so switching is just a model-name change.
Specs & limits
| Max output (vendor spec) | 64,000 |
| Modalities | text + image → text |
| Features | tools · parallel_tool_calls · structured_output · streaming · vision · batch · caching · reasoning · computer_use |
| Training data through | 2025-07 (answers reliable to 2025-02) |
| Notable | Fastest Claude with near-frontier intelligence; extended thinking supported (not adaptive); 200k context / 64k max output. |
| Prompt caching | explicit (opt-in) · min 4,096-token prefix · TTL 5m default, 1h option · writes 1.25x (5m) / 2x (1h) |
FAQ
Is the Claude Haiku 4.5 API free to try?
Yes: new accounts get 10 trial calls and up to $1 in free credit, no card required. At $1/M input tokens, that credit alone covers roughly 125 requests of ~8K tokens against Claude Haiku 4.5.
What is Claude Haiku 4.5 best at?
Fastest with near-frontier intelligence, plus lowest latency and price in the current lineup and extended thinking, vision input, and prompt caching. See the About section for the full picture from the vendor's own release notes.
How much does Claude Haiku 4.5 cost?
Claude Haiku 4.5 costs $1 per million input tokens and $5 per million output tokens on Synthorai. That is the provider's list price, with no platform markup. Cached input tokens bill at $0.1/M.
Does Claude Haiku 4.5 support prompt caching?
Yes, via opt-in: mark stable prefixes with cache_control breakpoints. Cached input tokens bill at $0.1/M vs $1/M uncached; prompts need a 4,096-token stable prefix to cache (TTL 5m default, 1h option). Prompt caching guide →
How do I get access to Claude Haiku 4.5?
Point your existing OpenAI SDK at base_url="https://synthorai.io/v1", set model="claude-haiku-4-5", and you're done. One API key covers every model on the gateway.
What is Claude Haiku 4.5's knowledge cutoff?
Claude Haiku 4.5's knowledge cutoff is 2025-02, per the vendor's official documentation (as of 2026-07-09).