AI-ASSISTANTS
GitHub Copilot adds Claude Opus 5.5 and two GPT-6 variants in a single week, cementing its model marketplace position.
Alternatives · AI assistants
Retell AI alternatives
The best Retell AI alternatives in AI assistants, ranked by Sparkpulse's velocity_score.
Updated Sep 23, 2026
Looking for the best alternatives to Retell AI? Sparkpulse tracks and ranks 12 alternatives in AI assistants by shipping velocity — how frequently each ships meaningful updates, verified from official changelogs. For reference, Retell AI shipped 0 meaningful updates in the last 30 days and carries a velocity score of 0.0 out of 10 in 2026. The alternatives below are ranked the same way, so you're comparing real release momentum, not marketing claims.
About Retell AI
Voice-AI platform building toward composable, flexibly-routed agents
Retell builds voice AI agents, and the captured releases (through early 2026) center on making complex agents maintainable and adaptive: Agent Transfer for handing context between modular agents, Flex Mode for non-linear flow navigation, reusable Flow Components, and node-level knowledge bases. Add to that a chat widget, an AI QA Analyst, and periodic pricing adjustments.
Velocity 0.0 · Last update 3mo ago
Top 12 alternatives to Retell AI
Ranked by recent ship velocity. Tap any card for the full editorial breakdown, or pivot to a head-to-head.
AI-ASSISTANTS
Gemini enters enterprise cybersecurity with specialized models and a government defense program
AI-ASSISTANTS
Claude ships Opus 5.5 as Anthropic builds out enterprise verticals and a tiered model ladder
AI-ASSISTANTS
OpenRouter expands beyond routing: Ori Eval, multimodal APIs, and config-as-code now in the catalog
AI-ASSISTANTS
Ollama v0.34.x exposes thinking-model reasoning levels as a native API field while steadily closing MLX memory and performance gaps.
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Dosu publishes a content series on agent memory architecture while the product feed shows no feature announcements.
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Baseten adds server-side web search as it builds toward a full inference orchestration platform
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InvokeAI 6.14 adds video generation via Wan 2.2 and native multi-GPU support.
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vLLM in a six-RC sprint to stabilize v0.29.0 with Mamba and hybrid prefix caching
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Character.AI is becoming an interactive entertainment studio, absorbing comics and original series into its Character ecosystem.
AI-ASSISTANTS
LibreChat v0.8.8 ships agent interruption and mid-run approval gates — agentic AI with human checkpoints.
AI-ASSISTANTS
DocsBot adds Facebook Messenger and a Data Explorer for knowledge gap analysis, expanding its channel coverage and analytics depth.
Retell AI vs alternatives — shipping velocity at a glance
Velocity score (0–10) and meaningful releases shipped in the last 30 days, from official changelogs. Higher = shipping faster.
| Product | Velocity | Sparks · 30d | Focus areas | Latest release |
|---|---|---|---|---|
| Retell AI (baseline) | 0.0 | 0 | voice-aiconversation-flowsagent-composition | Flex Mode for Conversation Flows |
| GitHub Copilot | 10.0 | 1 | model-marketplaceenterprise-controlsagentic-coding | Claude Opus 5.5 is now available in GitHub Copilot |
| Gemini | 10.0 | 0 | ai-modelscybersecurityagentic-ai | — |
| Claude | 8.8 | 3 | model-familyenterprisecrm-integration | Claude Opus 5.5 launches at 40% lower cost than Opus 5 |
| OpenRouter | 8.8 | 0 | model-routingevaluationmultimodal | — |
| Ollama | 7.5 | 1 | local-inferencemlx-backendthinking-models | v0.34.3-rc0: Native thinking-level API for reasoning models |
| Dosu | 7.5 | 0 | ai-agentsdeveloper-toolsagent-memory | — |
| Baseten | 6.3 | 1 | inferencemodel-apisgrounded-inference | Web search with Baseten Hosted Tools |
| InvokeAI | 6.3 | 1 | generative-aivideo-generationlocal-inference | InvokeAI 6.14.0 |
| vLLM | 6.3 | 0 | llm-inferenceprefix-cachingmoe-models | — |
| Character.AI | 6.3 | 1 | interactive-entertainmentcontent-studiocreator-tools | (c.ai) Comics and the Interactive Future of Fandom |
| LibreChat | 6.3 | 1 | agentic-workflowshuman-in-the-loopagent-interruption | v0.8.8-rc2 |
| DocsBot AI | 5.0 | 0 | ai-support-botknowledge-managementmulti-channel | — |
The 12 best Retell AI alternatives, in depth
1. GitHub Copilot · velocity 10.0
GitHub Copilot adds Claude Opus 5.5 and two GPT-6 variants in a single week, cementing its model marketplace position.
Over the last 30 days GitHub Copilot shipped 1 meaningful update vs Retell AI's 0, most recently “Claude Opus 5.5 is now available in GitHub Copilot”. Its velocity score of 10.0/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, GitHub Copilot focuses on model marketplace, enterprise controls and agentic coding.
Over the last 30 days GitHub Copilot has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
Full GitHub Copilot trajectory → · Compare Retell AI vs GitHub Copilot →
2. Gemini · velocity 10.0
Gemini enters enterprise cybersecurity with specialized models and a government defense program.
Its velocity score of 10.0/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Gemini focuses on ai models, cybersecurity and agentic ai.
Gemini and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
3. Claude · velocity 8.8
Claude ships Opus 5.5 as Anthropic builds out enterprise verticals and a tiered model ladder.
Over the last 30 days Claude shipped 3 meaningful updates vs Retell AI's 0, most recently “Claude Opus 5.5 launches at 40% lower cost than Opus 5”. Its velocity score of 8.8/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Claude focuses on model family, enterprise and crm integration.
Over the last 30 days Claude has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
4. OpenRouter · velocity 8.8
OpenRouter expands beyond routing: Ori Eval, multimodal APIs, and config-as-code now in the catalog.
Its velocity score of 8.8/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, OpenRouter focuses on model routing, evaluation and multimodal.
OpenRouter and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full OpenRouter trajectory → · Compare Retell AI vs OpenRouter →
5. Ollama · velocity 7.5
Ollama v0.34.x exposes thinking-model reasoning levels as a native API field while steadily closing MLX memory and performance gaps.
Over the last 30 days Ollama shipped 1 meaningful update vs Retell AI's 0, most recently “v0.34.3-rc0: Native thinking-level API for reasoning models”. Its velocity score of 7.5/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Ollama focuses on local inference, mlx backend and thinking models.
Over the last 30 days Ollama has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
6. Dosu · velocity 7.5
Dosu publishes a content series on agent memory architecture while the product feed shows no feature announcements.
Its velocity score of 7.5/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Dosu focuses on ai agents, developer tools and agent memory.
Dosu and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
7. Baseten · velocity 6.3
Baseten adds server-side web search as it builds toward a full inference orchestration platform.
Over the last 30 days Baseten shipped 1 meaningful update vs Retell AI's 0, most recently “Web search with Baseten Hosted Tools”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Baseten focuses on inference, model apis and grounded inference.
Over the last 30 days Baseten has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
8. InvokeAI · velocity 6.3
InvokeAI 6.14 adds video generation via Wan 2.2 and native multi-GPU support.
Over the last 30 days InvokeAI shipped 1 meaningful update vs Retell AI's 0, most recently “InvokeAI 6.14.0”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, InvokeAI focuses on generative ai, video generation and local inference.
Over the last 30 days InvokeAI has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
Full InvokeAI trajectory → · Compare Retell AI vs InvokeAI →
9. vLLM · velocity 6.3
VLLM in a six-RC sprint to stabilize v0.29.0 with Mamba and hybrid prefix caching.
Its velocity score of 6.3/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, vLLM focuses on llm inference, prefix caching and moe models.
vLLM and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
10. Character.AI · velocity 6.3
Character.AI is becoming an interactive entertainment studio, absorbing comics and original series into its Character ecosystem.
Over the last 30 days Character.AI shipped 1 meaningful update vs Retell AI's 0, most recently “(c.ai) Comics and the Interactive Future of Fandom”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Character.AI focuses on interactive entertainment, content studio and creator tools.
Over the last 30 days Character.AI has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
Full Character.AI trajectory → · Compare Retell AI vs Character.AI →
11. LibreChat · velocity 6.3
LibreChat v0.8.8 ships agent interruption and mid-run approval gates — agentic AI with human checkpoints.
Over the last 30 days LibreChat shipped 1 meaningful update vs Retell AI's 0, most recently “v0.8.8-rc2”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, LibreChat focuses on agentic workflows, human in the loop and agent interruption.
Over the last 30 days LibreChat has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
Full LibreChat trajectory → · Compare Retell AI vs LibreChat →
12. DocsBot AI · velocity 5.0
DocsBot adds Facebook Messenger and a Data Explorer for knowledge gap analysis, expanding its channel coverage and analytics depth.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, DocsBot AI focuses on ai support bot, knowledge management and multi channel.
DocsBot AI and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full DocsBot AI trajectory → · Compare Retell AI vs DocsBot AI →
Frequently asked questions
What are the best alternatives to Retell AI?
The top Retell AI alternatives we currently track in AI assistants are GitHub Copilot, Gemini, Claude, OpenRouter, Ollama, ranked by recent ship velocity.
How is this list of Retell AI alternatives ranked?
Alternatives are ranked by Sparkpulse's velocity_score — release cadence + 30-day spark count + sector-relative ship rate.
Can I compare Retell AI directly with one of these alternatives?
Yes — every card has a "Compare with Retell AI" link to a side-by-side /compare page.