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GLM 5.3 Flash API Pricing & Monthly Cost Simulator

Verified 2026 unit economics for Z.ai / GLM GLM 5.3 Flash (z-ai/glm-5.3-flash): $0.04/1M uncached input, $0.03/1M cached prefix read, and $0.078/1M output across a 1,048,576-token context window (released 2026-08-26).

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Uncached Input (/1M)
$0.04
Cached Prompt Read (/1M)
$0.03 (-25%)
Output Completion (/1M)
$0.078
50% Batch API (In / Out)
Real-time API only (no 50% async batch)

Interactive 30-Day Monthly Spend Simulator

Live Unit-Cost & Prompt Cache Slider (GLM 5.3 Flash)
z-ai/glm-5.3-flash
Estimated 30-day spend
$6.08/mo
Cost per 1,000 calls
$0.2025
Monthly savings vs 0% cache
$0.59/mo
Open in full 60-model ledger → Size 429 rate limits for GLM 5.3 Flash → Check Z.ai / GLM EOL lifecycle on LLMEOL →

Technical Limits & API Capabilities

Context window
1,048,576
Max output tokens
131,072
Workload tier
Coding & Agent
Input modalities
text, image, video
Tool Calling: Yes JSON Schema Strict: Yes Reasoning Tokens: Supported Batch API: Unavailable

Same-Category 2026 Model Alternatives (Coding & Agent)

Unit pricing and context comparison across Coding & Agent models
Model Provider Input / Cached ($/1M) Output ($/1M) Context / Max Out
GLM 5.3 FlashZ.ai / GLM$0.04 / $0.03$0.0781,048,576 / 131,072
Gemini 4 HydrogenGoogle$1.5 / $0.075$7.51,048,576 / 943,718
Gemini 4 CarbonGoogle$2 / $0.1$101,048,576 / 943,718
Muse EmberMeta$0.1 / $0.004$0.51,048,576 / 943,718
GPT-6.1 TerraOpenAI$1 / $0.05$51,050,000 / 128,000
MiniMax M3.1 FlashMiniMax$0.15 / $0.015$0.61,048,576 / 524,288
Muse Spark OpenMeta$1.25 / $0.15$4.251,048,576 / 943,718

Head-to-Head Matchups Featuring GLM 5.3 Flash

Frequently Asked Questions

How much does GLM 5.3 Flash cost per 1 million tokens in 2026?

GLM 5.3 Flash by Z.ai / GLM is billed at $0.04 per 1M uncached input tokens, $0.03 per 1M cached input read tokens (25% cache discount), and $0.078 per 1M output tokens.

What are the context window and max output token limits for GLM 5.3 Flash?

GLM 5.3 Flash supports a 1,048,576-token input context window and up to 131,072 completion output tokens per request, accepting text, image, video inputs.

Does GLM 5.3 Flash support strict JSON Schema outputs, tool calling, and Batch API?

GLM 5.3 Flash capability profile: tool calling = Supported, strict JSON Schema structured outputs = Supported, reasoning mode = Supported, and 50% asynchronous Batch API = Not listed.