New: Claude Opus 5 now available

One API. Every Model.
Zero Hassle.

Access Claude, GPT, Gemini and more through a single OpenAI-compatible endpoint. No VPN needed. Pay only for what you use.

Get Started Free → View Pricing
shell # Just change your base_url — that's it
curl https://api.kissapi.ai/v1/chat/completions \
  -H "Authorization: Bearer $KISSAPI_KEY" \
  -d '{"model":"claude-opus-5","messages":[...]}'

// One endpoint, every workflow //

Point your tools at KissAPI and keep working.

The same requests you already write, routed to whichever model fits the job — no provider accounts, no regional workarounds.

@claude-opus-5refactor this 2k-line module and keep the tests green@cursorswap the base URL, keep every model@claude-haiku-4-5classify 40k support tickets overnight@gpt-5.6-lunadraft 200 product blurbs, cheapest tier@claude-codeship the migration, run it end to end@claude-opus-5refactor this 2k-line module and keep the tests green@cursorswap the base URL, keep every model@claude-haiku-4-5classify 40k support tickets overnight@gpt-5.6-lunadraft 200 product blurbs, cheapest tier@claude-codeship the migration, run it end to end
@gpt-5.6-soltrace this race condition through four services@claude-sonnet-5review the diff before I open the PR@codex-cliwire up the CI pipeline from scratch@claude-opus-4-8plan a two-week refactor, then execute it@clineone key, no provider account needed@gpt-5.6-soltrace this race condition through four services@claude-sonnet-5review the diff before I open the PR@codex-cliwire up the CI pipeline from scratch@claude-opus-4-8plan a two-week refactor, then execute it@clineone key, no provider account needed
@gpt-5.6-terrasummarise 800 PDFs into one report@claude-sonnet-4-6high-volume calls, same 200K context@windsurfswitch models mid-conversation@extended-thinkingbudget_tokens 32k, stream it back@openai-sdkchange one line, nothing else@gpt-5.6-terrasummarise 800 PDFs into one report@claude-sonnet-4-6high-volume calls, same 200K context@windsurfswitch models mid-conversation@extended-thinkingbudget_tokens 32k, stream it back@openai-sdkchange one line, nothing else

TIPMix models inside one workflow — plan with Opus, execute with Sonnet.

// Why KissAPI //

Built for developers who ship fast

No account juggling, no regional workarounds. One key, one endpoint, and the same request shape you already write.

OpenAI-Compatible

Drop-in replacement. Change one line of code — your base URL — and access any supported model instantly.

1 lineto migrate

Global Access

Reliable connectivity worldwide. No VPN or proxy configuration required. Just works, everywhere.

30+countries served

Low Latency

Optimized routing with streaming support. Average response time under 3 seconds for most models.

<3savg response

Pay As You Go

No subscriptions, no commitments. Top up your balance and pay only for the tokens you consume.

5×credit per top-up

Reliable & Stable

Multi-channel load balancing with automatic failover. Built for consistent, reliable access.

99.5%uptime, 30-day

Full Transparency

Real-time usage dashboard. Track every request, monitor spending, and manage API keys with ease.

100%requests logged
// Supported models //

Access the best AI models in one place

Every card shows the list price struck through, then your KissAPI rate. Same weights, same context window, same streaming API.

Anthropic best value

Claude Opus 5

Within 0.5% of flagship Fable 5 at half the price. The default pick for daily coding.
Context200K
Input / 1M$5.00$4.00
Output / 1M$25.00$20.00
Ratio×0.8
Anthropic flagship

Claude Opus 4.8

Flagship reasoning. Best for hard refactors and long-running agents.
Context200K
Input / 1M$5.00$4.00
Output / 1M$25.00$20.00
Ratio×0.8
Anthropic newest

Claude Sonnet 5

Newest Sonnet generation. Stronger tool use at the same tier.
Context200K
Input / 1M$3.00$2.40
Output / 1M$15.00$12.00
Ratio×0.8
Anthropic balanced

Claude Sonnet 4.6

Near-Opus quality at Sonnet rates. The workhorse for high-volume calls.
Context200K
Input / 1M$3.00$2.40
Output / 1M$15.00$12.00
Ratio×0.8
Anthropic fastest

Claude Haiku 4.5

Ultra-fast and cheap. Built for classification, extraction and tight loops.
Context200K
Input / 1M$1.00$0.80
Output / 1M$5.00$4.00
Ratio×0.8
OpenAI top tier

GPT-5.6 Sol

The heavyweight of the 5.6 family. Deepest reasoning, widest tool use.
Context—
Input / 1M$5.00$2.50
Output / 1M$40.00$20.00
Ratio×0.5
OpenAI balanced

GPT-5.6 Terra

The middle tier most teams settle on. Strong output, moderate spend.
Context—
Input / 1M$3.00$1.50
Output / 1M$18.00$9.00
Ratio×0.5
OpenAI lightweight

GPT-5.6 Luna

Cheapest 5.6 tier. Fast drafts, routing decisions and high-frequency calls.
Context—
Input / 1M$1.50$0.75
Output / 1M$9.00$4.50
Ratio×0.5
Extended thinkingEvery Claude model accepts budget_tokens, streamed back token by token.
Growing libraryNew models land weekly. Ask and we will route one for you.
View all models →
// Two discounts, stacked //

Your credits are discounted twice.

First when you top up, again when a request is billed. The struck-through figures on the cards above are vendor list prices — here is how far below them you actually land.

01 Top-up bonusPay $1, receive $5 in API credits. Every tier, no expiry. ×0.2real spend
02 Group ratioCredits are charged below list price: Claude ×0.8, OpenAI ×0.5. ×0.8 / 0.5per model
List price × Group ratio × Top-up bonus = What it costs you

Claude Opus 5 output, per 1M tokens:
$25.00 list → $20.00 in credits → $4.00 out of your pocket.

84%below list — Claude
90%below list — OpenAI
Pricing
Simple, transparent pricing

All prices in USD. No hidden fees. Pay per token, top up anytime.

$5 → $25

A small balance to try every model.
$5 one-time
credited instantly, never expires
  • Every model, one keyClaude Opus 5, Sonnet 4.6, Haiku 4.5, GPT-5.
  • OpenAI-compatibleDrop-in base URL for Cursor, Claude Code, any SDK.
  • Usage dashboardPer-request logs, spend tracking, key management.
  • Credits never expireNo subscription, no monthly minimum.
Top Up $5

$10 → $50

Most popular — where daily coding usually lands.
$10 one-time
credited instantly, never expires
  • Every model, one keyClaude Opus 5, Sonnet 4.6, Haiku 4.5, GPT-5.
  • OpenAI-compatibleDrop-in base URL for Cursor, Claude Code, any SDK.
  • Usage dashboardPer-request logs, spend tracking, key management.
  • Credits never expireNo subscription, no monthly minimum.
Top Up $10

$20 → $100

A bigger balance for agent swarms and batch jobs.
$20 one-time
credited instantly, never expires
  • Every model, one keyClaude Opus 5, Sonnet 4.6, Haiku 4.5, GPT-5.
  • OpenAI-compatibleDrop-in base URL for Cursor, Claude Code, any SDK.
  • Usage dashboardPer-request logs, spend tracking, key management.
  • Credits never expireNo subscription, no monthly minimum.
Top Up $20
Top-up calculator
$10you pay
$5$10$20$50$100
$50in credits
Every top-up is credited 5×
Claude Opus 58.3M tokens
Claude Sonnet 4.641.7M tokens
Claude Haiku 4.5156M tokens
Top Up Now

Blended estimate at a 3:1 input/output ratio. Actual usage depends on your prompts.

// Use cases //

Built for every AI workflow

One endpoint covers the whole stack — editors, agents, batch jobs and production traffic.

01

AI-Powered IDEs

Use Claude and GPT-5 in Cursor, Windsurf, Cline, or any editor that speaks the OpenAI format. One key, every model.

CursorWindsurfClineZed
02

Agents & Automation

Run Claude Code, Codex CLI or your own framework. Multi-channel routing fails over without touching your code.

Claude CodeCodex CLILangChain
03

Batch Processing

Classify documents, generate embeddings, run evals at scale. Per-token billing keeps large jobs predictable.

200K contextstreamingno rate tiers
04

SaaS & Products

Ship AI features without juggling provider accounts. Unified billing, usage logs and model switching in one place.

one invoiceusage logskey rotation
05

Chat & Assistants

Point Cherry Studio, Open WebUI or LobeChat at one endpoint and switch models mid-conversation.

Cherry StudioOpen WebUILobeChat
06

Research & Evals

Benchmark Opus against Sonnet and GPT-5 side by side on identical prompts, then compare cost per run.

model A/Bcost per runextended thinking

// By the numbers //

Numbers, not adjectives.

What the gateway actually handles today. Pricing is per million tokens, billed per token with no minimum spend.

800+
Registered developers
across 30+ countries
99.5%
API uptime
rolling 30-day, all channels
50M+
Tokens served daily
peak 4.1M / hour
200K
Context window
every Claude model, no tiering
Model Input / 1M Output / 1M Cost of 10M tokens You save
Claude Opus 5$4.00$20.00$80.00$20.00 (20%)
Claude Opus 4.8$4.00$20.00$80.00$20.00 (20%)
Claude Sonnet 5$2.40$12.00$48.00$12.00 (20%)
Claude Sonnet 4.6$2.40$12.00$48.00$12.00 (20%)
Claude Haiku 4.5$0.80$4.00$16.00$4.00 (20%)
GPT-5.6 Sol$2.50$20.00$68.75$68.75 (50%)
GPT-5.6 Terra$1.50$9.00$33.75$33.75 (50%)
GPT-5.6 Luna$0.75$4.50$16.88$16.88 (50%)

Cost of 10M tokens assumes a 3:1 input/output split, priced at the KissAPI rate. Savings compare the same volume against the list price for that model.

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