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Constraint stability side by side — pricing, limits, model availability, transparency. Based on tracked changes (not capability benchmarks).

Stable = no recent tightening

Shifting = some recent changes

Volatile = frequent recent tightening

01 / FULL MATRIX

AUDIO

ToolVerdictPricingLimitsModelsTransparency90dLast change
ElevenLabsCautionStable100Shifting75Volatile53Stable10013Limits the number of files held in memory for widget file-input, requiring summarization for larger sets. (Aug 2026)

CHAT

ToolVerdictPricingLimitsModelsTransparency90dLast change
Character.AIStableStable100Stable100Stable97Stable1001Adds world-building context for Characters; beta with staged early access. (Jul 2026)
ChatGPTStableStable100Stable99Stable97Stable1002Increases model availability for free tier users, removing previous access restrictions. (Aug 2026)
ClaudeWatchStable100Stable91Stable92Shifting8713Anthropic announced tightened biology-domain safeguards for Fable 5; announcement headline only, no published detail on which requests are affected. (Aug 2026)
DeepSeekCautionVolatile0Stable99Stable93Stable100105DeepSeek V4 Pro input price $0.90 → $0.69 per 1M tokens (-24%) (Sep 2026)
GeminiStableStable100Shifting86Stable100Stable9510Google AI Pro and Ultra became available in Hong Kong and Macau. (Jul 2026)
GrokWatchStable100Stable100Stable100Stable9013Adds new video generation capabilities including text-to-video and image-to-video. (Jul 2026)
Mistral Le ChatCautionShifting82Stable100Stable100Stable1005Adds a new model, Shieldstral, to the available lineup. (Aug 2026)
PerplexityStableStable100Shifting72Stable100Shifting722Adds enterprise role-based access controls, a custom API credential vault, Brain access for Max subscribers and Opus 5. (Jul 2026)
PoeStableStable99Stable100Stable100Stable1000Lower entry price for light users; the cheap tier is daily-capped vs the monthly-pooled higher tiers (Nov 2024)

CODING

ToolVerdictPricingLimitsModelsTransparency90dLast change
Bolt.newStableStable100Stable100Stable100Stable1003Adds a one-click security agent that scans, fixes and hardens generated apps before publishing. (Jul 2026)
CursorStableStable90Stable96Stable100Stable10011Adds new integration capabilities for Google Workspace users. (Aug 2026)
DevinWatchStable94Stable92Stable95Stable1007Allows users to customize Slack integration scope, reducing potential over-permissioning. (Jul 2026)
GitHub CopilotCautionShifting85Stable96Volatile40Stable10052Users must now manually request Copilot code reviews instead of having them automatically assigned by the Code Quality feature. (Aug 2026)
LovableWatchStable100Stable100Stable97Stable10012Default-model swap for any app that does not pin a model — output behaviour can shift with no action by the builder (announced in the changelog). (Jul 2026)
ReplitStableShifting87Stable97Stable100Stable964Reduces friction by enabling direct workflow integration between Claude and Replit. (Jun 2026)
TabnineCautionStable98Shifting79Shifting82Stable10015Removes unauthorized bypasses for governance and agent feature controls, enforcing stricter policy compliance. (Jul 2026)
v0StableStable95Stable100Stable100Stable9730Adds new image generation model capability to Vercel AI Gateway. (Aug 2026)
WindsurfCautionStable91Stable89Stable96Stable1004Agents are disabled when working in Restricted Mode, preventing automated assistance in sensitive or untrusted environments. (Jul 2026)

IMAGE

ToolVerdictPricingLimitsModelsTransparency90dLast change
IdeogramStableStable100Stable100Stable100Stable1000Self-hosters can drop API dependency/billing lock-in entirely (Jun 2026)
Leonardo.aiStableStable100Stable100Stable100Stable1000Roadmap risk of shifting toward enterprise/Canva integration over individual creators (Jul 2024)
MidjourneyStableStable98Stable100Stable100Stable1003New model version released; default-model status not stated in the announcement. (Jul 2026)

MUSIC

ToolVerdictPricingLimitsModelsTransparency90dLast change
SunoStableStable96Stable100Stable95Stable1001Adds a new advanced stem separation feature restricted to Premier subscribers. (Jun 2026)

PRODUCTIVITY

ToolVerdictPricingLimitsModelsTransparency90dLast change
Notion AIStableStable90Stable99Stable100Stable1008Reduces friction for providing context to agents by enabling direct sharing from the document menu. (Aug 2026)

VIDEO

ToolVerdictPricingLimitsModelsTransparency90dLast change
HeyGenStableStable95Stable94Stable93Stable1001New features added including live avatar APIs and cloud rendering capabilities. (Jul 2026)
Kling AIStableStable100Stable100Stable95Stable1000Pro/Premier subscribers locked out of the flagship model at launch — must upgrade to Ultra (~$180/mo) for day-one access (Feb 2026)
Luma Dream MachineStableStable95Stable97Stable99Stable941Adds new workflow automation capabilities for users. (Jun 2026)
RunwayStableStable100Stable100Stable88Stable1000Users lose unlimited slow-lane drafting; every generation now costs credits (though Max gives ~4x more credits than Unlimited's 2,250) (Jun 2026)
SoraStableStable100Stable96Stable100Stable1000Free-tier creators effectively blocked from iterative daily use (Nov 2025)
SynthesiaStableStable100Stable98Stable98Stable1000Annual subscribers benefit; monthly subscribers see no relief — pressure to commit annually (Sep 2025)

02 / HEAD-TO-HEAD

Curated same-category comparisons — constraint history side by side.