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Update image limits test with comprehensive 8k stress test results
Tested max 8kx8k images per provider: - Anthropic: 100 (explicit limit, fails at 101) - OpenAI: 100-200 (100 works, 200 times out) - Mistral: 8 (explicit limit, fails at 9) - xAI: 100-150 (100 works, 150 times out) - Groq: 0 (8k exceeds 33M pixel limit) - zAI: 400 (context window limited at 500) - OpenRouter: 40 (context window limited at 50) - Gemini: untested (no API key in test env) Key finding: Anthropic's 'many images' rule does NOT cause API errors. 100 x 8kx8k images work fine. Anthropic likely auto-resizes internally. Related to #120
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Mario Zechner
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1 changed files with 49 additions and 44 deletions
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@ -11,33 +11,32 @@
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* DISCOVERED LIMITS (Dec 2025):
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* ============================================================================
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*
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* | Provider | Model | Max Images | Max Size | Max Dimension | Max 8k Images |
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* |-------------|--------------------|------------|----------|---------------|---------------|
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* | Anthropic | claude-3-5-haiku | 100 | 5MB | 8000px | 100 |
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* | OpenAI | gpt-4o-mini | 500 | ≥25MB | ≥20000px | ≥50 |
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* | Gemini | gemini-2.5-flash | ~2000+* | ≥40MB | 8000px | (untested) |
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* | Mistral | pixtral-12b | 8 | ~15MB | 8000px | 8 |
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* | OpenRouter | z-ai/glm-4.5v | ~40** | ~10MB | ≥20000px | ≥10 |
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* | xAI | grok-2-vision | ≥100 | 25MB | 8000px | ≥50 |
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* | Groq | llama-4-scout-17b | 5 | ~5MB | ~5760px*** | 0**** |
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* | zAI | glm-4.5v | ≥100 | ≥20MB | 8000px | ≥50 |
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* | Provider | Model | Max Images | Max Size | Max Dim | Max 8k Imgs |
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* |-------------|--------------------|------------|----------|----------|-------------|
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* | Anthropic | claude-3-5-haiku | 100 | 5MB | 8000px | 100 |
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* | OpenAI | gpt-4o-mini | 500 | ≥25MB | ≥20000px | 100-200* |
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* | Gemini | gemini-2.5-flash | ~2000** | ≥40MB | 8000px | (untested) |
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* | Mistral | pixtral-12b | 8 | ~15MB | 8000px | 8 |
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* | xAI | grok-2-vision | ≥100 | 25MB | 8000px | 100-150* |
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* | Groq | llama-4-scout-17b | 5 | ~5MB | ~5760px | 0*** |
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* | zAI | glm-4.5v | ≥100 | ≥20MB | 8000px | 400**** |
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* | OpenRouter | z-ai/glm-4.5v | ~40**** | ~10MB | ≥20000px | 40**** |
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*
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* Notes:
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* - Anthropic: Docs mention a "many images" rule (>20 images = 2000px max),
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* but testing shows 100 x 8k images work fine. Anthropic may auto-resize
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* internally. Total request size capped at 32MB.
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* - OpenAI: Documented limit is 20MB, but we observed ≥25MB working.
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* No dimension limit found up to 20000px.
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* - Gemini: * Very permissive on count, hits rate limits before image limits.
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* Dimension limit is 8000px (same as Anthropic).
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* - Mistral: Very restrictive on image count (only 8 images allowed).
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* Dimension limit is 8000px.
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* - OpenRouter: ** Limited by context window (65k tokens), not explicit image
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* limit. No dimension limit found up to 20000px.
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* - xAI: 25MB limit (26214400 bytes exactly). Dimension limit ~8000px.
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* - Groq: *** Very restrictive. Max 5 images, ~5MB size, 33177600 pixels max
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* (≈5760x5760). **** 8k images exceed pixel limit so 0 supported.
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* - zAI: Permissive, similar to Anthropic limits.
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* internally. Total request size capped at 32MB. Explicit error at 101+.
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* - OpenAI: * 100 x 8k succeeded, 200 x 8k failed with timeout. Actual limit
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* likely between 100-200. Documented size limit is 20MB but ≥25MB works.
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* - Gemini: ** Very permissive on count, hits rate limits before image limits.
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* - Mistral: Very restrictive (8 images max). Explicit error at 9+.
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* - xAI: * 100 x 8k succeeded, 150 x 8k timed out. 25MB size limit exact.
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* - Groq: *** Most restrictive. 5 images max, 33177600 pixels max (≈5760x5760).
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* 8k images (64M pixels) exceed limit, so 0 supported.
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* - zAI: **** Context-window limited (65536 tokens). 400 x 8k succeeded,
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* 500 x 8k exceeded token limit.
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* - OpenRouter: **** Context-window limited (65536 tokens), not explicit
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* image limit. 40 x 8k succeeded, 50 x 8k exceeded token limit.
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*
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* ============================================================================
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* PRACTICAL RECOMMENDATIONS FOR CODING AGENTS:
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@ -858,14 +857,14 @@ describe("Image Limits E2E Tests", () => {
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);
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});
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// Anthropic - known to have "many images" rule (>20 images = 2000px max dimension)
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// Testing to find actual limit with 8k dimension images
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// Anthropic - known 100 image limit, testing if 8k dimensions change this
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it.skipIf(!process.env.ANTHROPIC_API_KEY)(
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"Anthropic: max 8k images before rejection",
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{ timeout: 600000 },
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{ timeout: 900000 },
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async () => {
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const model = getModel("anthropic", "claude-3-5-haiku-20241022");
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const counts = [5, 10, 15, 20, 21, 25, 30, 40, 50, 60, 80, 100];
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// Known limit is 100 images - test around that boundary
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const counts = [10, 20, 50, 80, 100, 110, 120];
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let lastSuccess = 0;
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let lastError: string | undefined;
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@ -888,13 +887,14 @@ describe("Image Limits E2E Tests", () => {
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},
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);
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// OpenAI
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// OpenAI - known 500 image limit
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it.skipIf(!process.env.OPENAI_API_KEY)(
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"OpenAI: max 8k images before rejection",
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{ timeout: 600000 },
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{ timeout: 1800000 },
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async () => {
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const model = getModel("openai", "gpt-4o-mini");
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const counts = [5, 10, 20, 30, 50];
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// Known limit is 500 images - test around that boundary
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const counts = [50, 100, 200, 300, 400, 500, 550];
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let lastSuccess = 0;
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let lastError: string | undefined;
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@ -917,13 +917,14 @@ describe("Image Limits E2E Tests", () => {
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},
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);
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// Gemini
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// Gemini - known to be very permissive (~2000+ small images), but 8k may differ
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it.skipIf(!process.env.GOOGLE_API_KEY)(
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"Gemini: max 8k images before rejection",
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{ timeout: 600000 },
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{ timeout: 1800000 },
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async () => {
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const model = getModel("google", "gemini-2.5-flash");
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const counts = [5, 10, 20, 30, 50];
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// Test progressively - 8k images are large so limit may be lower
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const counts = [10, 50, 100, 200, 500, 1000];
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let lastSuccess = 0;
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let lastError: string | undefined;
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@ -946,13 +947,14 @@ describe("Image Limits E2E Tests", () => {
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},
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);
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// Mistral - already very limited (8 images max)
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// Mistral - known 8 image limit
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it.skipIf(!process.env.MISTRAL_API_KEY)(
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"Mistral: max 8k images before rejection",
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{ timeout: 600000 },
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async () => {
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const model = getModel("mistral", "pixtral-12b");
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const counts = [1, 2, 4, 6, 8];
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// Known limit is 8 images - test around that boundary
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const counts = [1, 2, 4, 6, 8, 9, 10];
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let lastSuccess = 0;
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let lastError: string | undefined;
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@ -975,10 +977,11 @@ describe("Image Limits E2E Tests", () => {
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},
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);
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// xAI
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it.skipIf(!process.env.XAI_API_KEY)("xAI: max 8k images before rejection", { timeout: 600000 }, async () => {
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// xAI - tested up to 100 small images successfully
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it.skipIf(!process.env.XAI_API_KEY)("xAI: max 8k images before rejection", { timeout: 1200000 }, async () => {
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const model = getModel("xai", "grok-2-vision");
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const counts = [5, 10, 20, 30, 50];
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// Test around the expected boundary
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const counts = [10, 50, 100, 150, 200];
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let lastSuccess = 0;
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let lastError: string | undefined;
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@ -1031,10 +1034,11 @@ describe("Image Limits E2E Tests", () => {
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},
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);
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// zAI
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it.skipIf(!process.env.ZAI_API_KEY)("zAI: max 8k images before rejection", { timeout: 600000 }, async () => {
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// zAI - tested up to 100 small images successfully, very permissive
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it.skipIf(!process.env.ZAI_API_KEY)("zAI: max 8k images before rejection", { timeout: 1800000 }, async () => {
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const model = getModel("zai", "glm-4.5v");
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const counts = [5, 10, 20, 30, 50];
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// Very permissive - extend to find actual limit
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const counts = [50, 100, 200, 300, 400, 500];
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let lastSuccess = 0;
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let lastError: string | undefined;
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@ -1056,13 +1060,14 @@ describe("Image Limits E2E Tests", () => {
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expect(lastSuccess).toBeGreaterThanOrEqual(5);
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});
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// OpenRouter
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// OpenRouter - context-window limited (~40 small images), 8k will be fewer
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it.skipIf(!process.env.OPENROUTER_API_KEY)(
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"OpenRouter: max 8k images before rejection",
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{ timeout: 600000 },
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{ timeout: 900000 },
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async () => {
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const model = getModel("openrouter", "z-ai/glm-4.5v");
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const counts = [1, 2, 3, 5, 10];
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// 8k images consume more tokens, so limit will be lower than 40
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const counts = [1, 2, 5, 10, 20, 30, 40, 50];
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let lastSuccess = 0;
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let lastError: string | undefined;
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