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AssemblyAI vs Google Gemini API: pricing, quotas & features (2025)

Best-in-class speech-to-text API — Universal models, 99 languages, low-latency streaming
vs. Gemini 2.5 Pro, Flash, Flash-Lite — multimodal + 2M context

Data sourced from vendor documentation · Last updated May 2026

AssemblyAI website ↗Google AI Studio ↗

Summary

AssemblyAI and Google Gemini API are both ai-api platforms, addressing the same core use case with different implementation philosophies and trade-offs. Both offer a free tier, making it easy to prototype without a credit card. Both have 11 documented features in Staxly's catalog. The right choice depends on your existing stack, team experience, and feature requirements. All pricing and quota data below is sourced from AssemblyAI and Google Gemini API's official documentation — not generated by AI or estimated.

AssemblyAI vs Google Gemini API: Comparativa de precios, cuotas y características (2025)

En esta comparativa analizamos AssemblyAI y Google Gemini API lado a lado — incluyendo precios mensuales, límites del tier gratuito, características técnicas, cuotas de uso (almacenamiento, transferencia, usuarios activos mensuales) y los interfaces de desarrollo disponibles. Todos los datos proceden de la documentación oficial de cada proveedor, no de respuestas generadas por IA.

AssemblyAI es una plataforma de la categoría ai-api — Best-in-class speech-to-text API — Universal models, 99 languages, low-latency streaming. Ofrece 3 tiers de precio: Free Credits gratuito, Pay-as-you-go gratuito, Enterprise (personalizado). Su catálogo en Staxly documenta 11 características y 7 interfazes para desarrolladores.

Google Gemini API pertenece a la categoría ai-api — Gemini 2.5 Pro, Flash, Flash-Lite — multimodal + 2M context. Ofrece 4 tiers de precio: Free Tier (AI Studio) gratuito, Paid API (Gemini API) gratuito, Vertex AI (GCP) gratuito, Gemini Enterprise (personalizado). Su catálogo documenta 11 características y 6 interfazes para desarrolladores.

A continuación encontrarás los tiers de precio completos de ambas plataformas, una matriz de cuotas del tier gratuito (transferencia, almacenamiento, MAU, llamadas a la API y otros límites), el listado completo de características y los interfaces (CLI, SDKs, REST, GraphQL, MCP) disponibles para integrar cada servicio.

¿Necesitas estos datos en tu agente de IA (Claude Code, Cursor, Zed)? Instala gratis el servidor MCP de Staxly y tendrás acceso estructurado a AssemblyAI, Google Gemini API y más de 130 plataformas para desarrolladores.

Pricing tiers

AssemblyAI

Free Credits
$50 in free credits on signup. Full API access.
Free
Pay-as-you-go
Per-hour billing by model. No minimum.
$0 base (usage-based)
Enterprise
Custom contracts. SLA, private deployments, BAA.
Custom
AssemblyAI website ↗

Google Gemini API

Free Tier (AI Studio)
Generous free tier with rate limits. Good for dev + prototyping. Data may be used to improve Google products.
Free
Paid API (Gemini API)
Pay-as-you-go per-token. Data NOT used for training.
$0 base (usage-based)
Vertex AI (GCP)
Enterprise deployment via Google Cloud. Same pricing structure + GCP features (IAM, VPC-SC, CMEK).
$0 base (usage-based)
Gemini Enterprise
Custom. Gemini 2.5 Deep Think model access + Google Workspace + Agentspace.
Custom
Google AI Studio ↗

Free-tier quotas head-to-head

Comparing free-trial on AssemblyAI vs free-tier on Google Gemini API.

MetricAssemblyAIGoogle Gemini API
No overlapping quota metrics for these tiers.

Features

AssemblyAI · 11 features

  • Advanced Prompting — Streaming with disfluency + code-switching + realtime diarization.
  • Audio Intelligence — Sentiment, topic detection, summarization, entity detection, content safety, IAB…
  • Auto Punctuation — Smart capitalization + punctuation.
  • Keyterm Prompting — Boost accuracy for domain vocabulary.
  • LeMUR (LLM framework) — Run LLMs over transcripts: Q&A, summary, action items.
  • Medical Mode — Specialized for clinical + medical vocabulary.
  • PII Redaction — Auto-redact credit cards, SSNs, addresses, emails.
  • Pre-recorded Transcription — Upload audio/video URL or file → transcript.
  • Realtime Streaming — WebSocket-based low-latency STT.
  • Speaker Diarization — Identify who spoke when.
  • Webhooks — Auto-notify when transcription finishes.

Google Gemini API · 11 features

  • Batch API — 50% discount for async processing.
  • Code Execution — Python code interpreter tool (sandboxed).
  • Context Caching — Cache system instructions + tools for up to 90% savings.
  • File API — Upload large files (up to 2 GB) for multimodal prompts.
  • Function Calling — JSON schema-based tool calling. Parallel supported.
  • Grounding with Search — Augment answers with Google Search results. Fact-checked citations returned.
  • Model Tuning — Supervised fine-tuning via AI Studio.
  • Multimodal Live API — Bidirectional streaming voice + video (WebSocket).
  • Safety Settings — Configurable thresholds for harm categories.
  • generateContent API — Core generation endpoint.
  • streamGenerateContent — Streaming variant with SSE.

Developer interfaces

KindAssemblyAIGoogle Gemini API
SDKassemblyai (Node), assemblyai (Python), assemblyai (Ruby), assemblyai-go@google/genai, google-genai (Python), google-genai-go
RESTAssemblyAI REST APIGemini REST API, Vertex AI Endpoint
MCP—Gemini MCP
OTHERStreaming WebSocket, Webhooks—

Key takeaways

  • Both AssemblyAI and Google Gemini API offer a free tier — AssemblyAI ("Free Credits") and Google Gemini API ("Free Tier (AI Studio)") — with no credit card required to start.
  • Both platforms have 11 documented features in Staxly's catalog.
  • Developer integrations differ: only AssemblyAI offers OTHER; only Google Gemini API offers MCP.
Staxly is an independent catalog of developer platforms. Some links to AssemblyAI and Google Gemini API may be affiliate links — Staxly may earn a commission if you sign up through them, at no extra cost to you. Pricing is verified against vendor pages at publication time — reconfirm before buying.

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