Compare Claude Fable 5 from Anthropic and GLM 5.3 from Z.AI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.
Claude Fable 5
GLM 5.3Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work（This model is extremely expensive and is not recommended for casual use.）
GLM-5.3 is Z.AI’s coding and agentic reasoning model, built for complex software engineering, long-running agent tasks, vulnerability analysis, and other demanding workloads. Building on GLM-5.2, it incorporates further post-training improvements to deliver stronger coding performance, better task execution, and greater token efficiency. We currently offer the production-ready GLM-5.3 API with unlimited concurrency, making it well suited for high-throughput workloads, coding agents, and large-scale automation. For a limited time, GLM-5.3 is available at 10% off.
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Promotional prices show the discounted rate; see each model page for promotion windows.
Daily traffic served through AIHubMix — how demand for each model is trending.
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
Estimate your monthly bill for the same workload on each model.
Monthly = daily × 30. Discounted rates applied where a promotion is active.
GLM 5.3: $3.9438/M output tokens; Claude Fable 5: $55/M. Use the cost calculator above to estimate your own workload.
GLM 5.3: 0.8s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
Claude Fable 5 accepts 1,000,000 and GLM 5.3 accepts 1,048,576 input tokens. Maximum output per request is 128,000 tokens on Claude Fable 5 and 131,072 tokens on GLM 5.3.
Claude Fable 5 at 68.1 tok/s and GLM 5.3 at 48.4 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.
Claude Fable 5 accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs; GLM 5.3 accepts text input and supports thinking, tool calling, function calling and structured outputs.
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