Neither wins outright: Anthropic: Claude Haiku 5.5 is the pick when cost matters at scale, Z.ai: GLM 5.3 Flash when you need seed (reproducible sampling).
| Spec | Anthropic: Claude Haiku 5.5 | Z.ai: GLM 5.3 Flash |
|---|---|---|
| Provider | Anthropic | Z Ai |
| Input price (per 1M tokens) | $0.10 | $0.15 |
| Output price (per 1M tokens) | $0.50 | $0.50 |
| Blended price (3:1 input/output) | $0.20 | $0.24 |
| Cheaper than … of all models we track | 69% | 67% |
| Context window | 1M tokens (~1,500 pages) | 1.0M tokens (~1,573 pages) |
| Larger context than … of all models | 70% | 81% |
| Max output per response | 128K tokens (~96,000 words) | 944K tokens (~707,800 words) |
| Input types | text, image, file | text, image, video |
| Output types | text | text |
| Free variant | No | No |
| Listed since | 2026-10-07 | 2026-08-26 |
Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.
| Workload (per month) | Anthropic: Claude Haiku 5.5 | Z.ai: GLM 5.3 Flash | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $17.50 | $21.25 | Anthropic: Claude Haiku 5.5 saves $3.75 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $17.00 | $23.00 | Anthropic: Claude Haiku 5.5 saves $6.00 |
| Coding / tool-using agent 2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens) | $18.00 | $24.00 | Anthropic: Claude Haiku 5.5 saves $6.00 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $11.00 | $15.00 | Anthropic: Claude Haiku 5.5 saves $4.00 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $5.50 | $8.00 | Anthropic: Claude Haiku 5.5 saves $2.50 |
| Capability | Anthropic: Claude Haiku 5.5 | Z.ai: GLM 5.3 Flash | What it lets you do |
|---|---|---|---|
| Tool / function calling | ✓ Yes | ✓ Yes | call your APIs and run agent loops |
| Structured output (JSON schema) | ✓ Yes | ✓ Yes | return JSON that validates against your schema |
| Reasoning / thinking mode | ✓ Yes | ✓ Yes | spend extra tokens thinking before answering hard problems |
| Image input | ✓ Yes | ✓ Yes | read screenshots, charts and scanned pages |
| Audio input | — | — | take speech or audio directly |
| File / PDF input | ✓ Yes | — | accept documents without your own parsing step |
| Image output | — | — | generate images, not just text |
| Built-in web search | ✓ Yes | — | answer from live web results |
| Seed (reproducible sampling) | — | ✓ Yes | repeat a generation for tests and evals |
| Log-probabilities | — | ✓ Yes | read token confidence for classification and scoring |
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
| Date | Model | Input / 1M | Output / 1M |
|---|---|---|---|
| 2026-10-07 | Z.ai: GLM 5.3 Flash | $0.15 | $0.50 |
| 2026-10-06 | Z.ai: GLM 5.3 Flash | $0.03 | $0.50 |
| 2026-09-28 | Z.ai: GLM 5.3 Flash | $0.15 | $0.50 |
| 2026-09-26 | Z.ai: GLM 5.3 Flash | $0.04 | $0.50 |
| 2026-09-25 | Z.ai: GLM 5.3 Flash | $0.04 | $0.60 |
| 2026-09-22 | Z.ai: GLM 5.3 Flash | $0.15 | $0.50 |
| 2026-09-17 | Z.ai: GLM 5.3 Flash | $0.09 | $0.30 |
| 2026-09-16 | Z.ai: GLM 5.3 Flash | $0.10 | $0.33 |
Neither wins outright: Anthropic: Claude Haiku 5.5 is the pick when cost matters at scale, Z.ai: GLM 5.3 Flash when you need seed (reproducible sampling). In short: Anthropic: Claude Haiku 5.5 when cost matters at scale, you need file / PDF input, you need built-in web search; Z.ai: GLM 5.3 Flash when you need seed (reproducible sampling), you need log-probabilities, you generate long outputs in one go.
Anthropic: Claude Haiku 5.5 is cheaper: $0.20 vs $0.24 per 1M tokens at a typical 3:1 input/output mix, 16% less. For 50,000 support conversations a month that is $17.50 against $21.25.
Anthropic: Claude Haiku 5.5 costs $0.10 per 1M input tokens and $0.50 per 1M output tokens; Z.ai: GLM 5.3 Flash costs $0.15 input and $0.50 output. Output tokens are billed separately, so long answers shift the gap.
Z.ai: GLM 5.3 Flash: 1.0M tokens, about 1,573 pages, against 1M (about 1,500 pages) for Anthropic: Claude Haiku 5.5.
Tool calling — Anthropic: Claude Haiku 5.5: yes, Z.ai: GLM 5.3 Flash: yes. JSON-schema structured output — Anthropic: Claude Haiku 5.5: yes, Z.ai: GLM 5.3 Flash: yes.
Yes, both accept image input.
No free variant is listed for either; both are pay-per-token.
Anthropic: Claude Haiku 5.5 can write up to 128K tokens (about 96,000 words) per response; Z.ai: GLM 5.3 Flash up to 944K (about 707,800 words).
Anthropic: Claude Haiku 5.5 was listed on 2026-10-07; Z.ai: GLM 5.3 Flash on 2026-08-26.
Anthropic: Claude Haiku 5.5: price unchanged since we started tracking it on 2026-10-08. Z.ai: GLM 5.3 Flash: input price raised 81% ($0.03 → $0.15/1M) on 2026-10-07 (10 price changes since 2026-08-27).
Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work such as summarization, subagents, and browser use. It succeeds Claude Haiku 4.5 with stronger coding, computer use, and...
Full Anthropic: Claude Haiku 5.5 specs →GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks. Its hybrid sparse and linear attention architecture maintains accurate long-context behavior while...
Full Z.ai: GLM 5.3 Flash specs →