Base44 Now Supports Claude Opus 4.8 for AI-Powered App Building
Base44Base44 added Claude Opus 4.8 to its AI model lineup, making Anthropic's most advanced reasoning model available to builders on the Builder plan or higher. Released by Anthropic on May 28, 2026, Opus 4.8 brings significant improvements in agentic coding accuracy, multi-step reasoning, and honesty, with benchmark performance jumping from 64.3% to 69.2% on SWE-Bench Pro over its predecessor. Base44 positions Opus 4.8 as the top-tier option for complex multi-step logic, intricate architecture decisions, and edge cases where you need the highest level of accuracy.
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Opus 4.8 Arrives in Base44
Base44 has expanded its AI model selection with the addition of Claude Opus 4.8, Anthropic's latest flagship reasoning model, released on May 28, 2026. Available to users on the Builder plan or higher, Opus 4.8 joins a lineup that includes Sonnet 4.6, Opus 4.6, GPT-5.4, GPT-5.5, and Gemini 3.1 Pro, giving builders more choice when tackling complex application logic.
What Opus 4.8 Brings to App Building
Opus 4.8 is positioned by Anthropic as its most capable model for hard, multi-step problems. For Base44 users, this means stronger performance on tasks that trip up lighter models: intricate database schema design, complex conditional logic, edge-case handling in multi-entity apps, and large-scale backend architecture decisions.
According to Anthropic, Opus 4.8 achieves 69.2% on SWE-Bench Pro, a coding benchmark, up from 64.3% for Opus 4.7. Multidisciplinary reasoning with tools improved from 54.7% to 57.9%, and knowledge work scoring jumped from 1,753 to 1,890. Anthropic also notes the model is more likely to flag uncertainties about its work and less likely to make unsupported claims, meaning builders get more reliable feedback when something is ambiguous or beyond the model's confidence.
A new Fast mode for Opus 4.8 operates approximately 2.5 times faster at three times lower cost, a meaningful improvement for iterative building workflows where speed matters. Pricing remains unchanged from Opus 4.7: $5 per million input tokens and $25 per million output tokens.
How to Use It in Base44
Builders who want to manually select Opus 4.8 need a Builder plan or higher. By default, Base44 uses automatic model selection, but the model picker allows switching to Opus 4.8 for specific sessions or tasks. Credit usage varies by model and is displayed per message, so builders can monitor their consumption in real time.
Base44 documents Opus 4.8 as best suited for complex multi-step logic, intricate architecture decisions, and edge cases where you need the highest level of accuracy. For routine builds and smaller apps, lighter models remain more cost-efficient, but for demanding projects, Opus 4.8 now provides the strongest available option within Base44's environment.