New Core Features:

• Advanced RAG by @langchain4j in https://github.com/langchain4j/langchain4j/pull/538
• Multimodality: support image inputs by @langchain4j in https://github.com/langchain4j/langchain4j/pull/428
• ConversationalRetrievalChain: adding metadata in the prompt by @mateusscheper in https://github.com/langchain4j/langchain4j/pull/431

New Integrations:

Model providers:

• Mistral AI by @czelabueno in https://github.com/langchain4j/langchain4j/pull/514
• Wenxin Qianfan by @lane12138 in https://github.com/langchain4j/langchain4j/pull/499
• Cohere Rerank by @langchain4j in https://github.com/langchain4j/langchain4j/pull/539

Embedding Stores:

• Azure AI Search by @jdubois in https://github.com/langchain4j/langchain4j/pull/530
• Qdrant by @Anush008 in https://github.com/langchain4j/langchain4j/pull/542
• Vearch by @Martin7-1 in https://github.com/langchain4j/langchain4j/pull/525

Document Loaders:

• Azure Blob Storage by @jdubois in https://github.com/langchain4j/langchain4j/pull/439
• GitHub by @jdubois in https://github.com/langchain4j/langchain4j/pull/415
• Tencent COS by @Martin7-1 in https://github.com/langchain4j/langchain4j/pull/421

Notable Updates:

• OpenAI: support image inputs by @langchain4j in https://github.com/langchain4j/langchain4j/pull/428
• OpenAI: support shortened embeddings by @langchain4j in https://github.com/langchain4j/langchain4j/pull/555
• OpenAI: support native images by @langchain4j in https://github.com/langchain4j/langchain4j/pull/497
• Vertex AI Gemini: support image inputs by @langchain4j in https://github.com/langchain4j/langchain4j/pull/428
• Vertex AI: image generation by @glaforge in https://github.com/langchain4j/langchain4j/pull/456
• Ollama: support image inputs by @bidek in https://github.com/langchain4j/langchain4j/pull/462
• Ollama: list available models by @bidek in https://github.com/langchain4j/langchain4j/pull/533
• Ollama: Spring Boot starter by @langchain4j in https://github.com/langchain4j/langchain4j-spring/pull/3
• Qwen: support image inputs by @jiangsier-xyz in https://github.com/langchain4j/langchain4j/pull/537

Technical Improvements and Bugfixes:

• Pre-built ollama models by @langchain4j in https://github.com/langchain4j/langchain4j/pull/419
• Image tests and docs. by @crutcher in https://github.com/langchain4j/langchain4j/pull/401
• Add documentation and tests for Document class by @crutcher in https://github.com/langchain4j/langchain4j/pull/376
• Add DocumentSplitterTest class by @crutcher in https://github.com/langchain4j/langchain4j/pull/378
• Add DocumentLoaderTest class and update DocumentLoader by @crutcher in https://github.com/langchain4j/langchain4j/pull/379
• Add DocumentTransformerTest class. by @crutcher in https://github.com/langchain4j/langchain4j/pull/380
• Add ChatLanguageModelTest class. by @crutcher in https://github.com/langchain4j/langchain4j/pull/381
• Add Javadoc to TokenCountEstimator and create TokenCountEstimatorTest by @crutcher in https://github.com/langchain4j/langchain4j/pull/382
• Retriever Interface Add a default method with memoryId by @leojames in https://github.com/langchain4j/langchain4j/pull/358
• Tests and docs for ImageModel api. by @crutcher in https://github.com/langchain4j/langchain4j/pull/383
• Tests and docs for JsonSchemaProperty api. by @crutcher in https://github.com/langchain4j/langchain4j/pull/387
• ToolExecutionRequest docs and tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/388
• Tests and docs for ToolParameters by @crutcher in https://github.com/langchain4j/langchain4j/pull/389
• Implement Metadata class tests and enhance documentation by @crutcher in https://github.com/langchain4j/langchain4j/pull/377
• ToolSpecification and ToolSpecifications docs and tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/390
• TextClassifier tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/391
• CosineSimilarity protection from zeros; full coverage tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/392
• InMemoryChatMemoryStore, tests by @crutcher in https://github.com/langchain4j/langchain4j/pull/393
• EmbeddingMatch tests by @crutcher in https://github.com/langchain4j/langchain4j/pull/394
• Utils test coverage and docs. by @crutcher in https://github.com/langchain4j/langchain4j/pull/396
• Exceptions utility docs and tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/397
• TokenUsage docs and tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/398
• Embedding tests and docs. by @crutcher in https://github.com/langchain4j/langchain4j/pull/399
• ChatMessage, UserMessage, AiMessage tests by @crutcher in https://github.com/langchain4j/langchain4j/pull/403
• Fix another Neo4jEmbeddingStoreTest error by @vga91 in https://github.com/langchain4j/langchain4j/pull/441
• Fix function without params for Azure Open AI by @kumlien in https://github.com/langchain4j/langchain4j/pull/443
• Added skeleton structure for docs by @amithkoujalgi in https://github.com/langchain4j/langchain4j/pull/458
• Full unittest coverage and docs for ValidationUtils. by @crutcher in https://github.com/langchain4j/langchain4j/pull/445
• Full test coverage of EmbeddingMatch. by @crutcher in https://github.com/langchain4j/langchain4j/pull/446
• Ensure that Redis pipelines are closed after usage by @gdarmont in https://github.com/langchain4j/langchain4j/pull/449
• Add support to Anthropic Claude v2.1 by @sergioa in https://github.com/langchain4j/langchain4j/pull/450
• Refactor ServiceHelper and add tests and docs. by @crutcher in https://github.com/langchain4j/langchain4j/pull/452
• Docs and default-case tests for Retriever. by @crutcher in https://github.com/langchain4j/langchain4j/pull/453
• Restructure ChatMessageType to structured enums. by @crutcher in https://github.com/langchain4j/langchain4j/pull/457
• set up documentation structure by @LizeRaes in https://github.com/langchain4j/langchain4j/pull/473
• Tests and Docs for default EmbeddingModel methods. by @crutcher in https://github.com/langchain4j/langchain4j/pull/454
• Test coverage for EmbeddingStore defaults. by @crutcher in https://github.com/langchain4j/langchain4j/pull/465
• Coverage test for Image.Builder.url(String) by @crutcher in https://github.com/langchain4j/langchain4j/pull/466
• GsonJsonCodec tests by @crutcher in https://github.com/langchain4j/langchain4j/pull/467
• TextSegment and TextSegmentTransformer tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/468
• Fix #460: no overlap when previous segment is shorter than maxOverlapSize by @langchain4j in https://github.com/langchain4j/langchain4j/pull/464
• UserMessage tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/469
• EmbeddingStoreIngestor test coverage. by @crutcher in https://github.com/langchain4j/langchain4j/pull/470
• Prompt test coverage. by @crutcher in https://github.com/langchain4j/langchain4j/pull/471
• Basic test for StreamingResponseHandler. by @crutcher in https://github.com/langchain4j/langchain4j/pull/475
• Utils.readBytes() test. by @crutcher in https://github.com/langchain4j/langchain4j/pull/472
• Add jacoco coverage targets to langchain4j-core, attached to the verify stage. by @crutcher in https://github.com/langchain4j/langchain4j/pull/474
• Tokenizer default methods tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/476
• ContentType migrated to structured enum. by @crutcher in https://github.com/langchain4j/langchain4j/pull/477
• Move RetryUtilsTest to langchain4j-core with RetryUtils. by @crutcher in https://github.com/langchain4j/langchain4j/pull/478
• Bump follow-redirects from 1.15.3 to 1.15.4 in /docs by @dependabot in https://github.com/langchain4j/langchain4j/pull/480
• Fix #444: Added missing GraalVM metadata for Gson and excluded commons-logging by @langchain4j in https://github.com/langchain4j/langchain4j/pull/482
• Fix #451: SentenceDetectorME is not thread-safe by @langchain4j in https://github.com/langchain4j/langchain4j/pull/481
• Document VertexAI authentication by @langchain4j in https://github.com/langchain4j/langchain4j/pull/463
• Add IntelliJ icon by @geoand in https://github.com/langchain4j/langchain4j/pull/495
• Updated Docs by @amithkoujalgi in https://github.com/langchain4j/langchain4j/pull/500
• Docu logos and domain by @amithkoujalgi in https://github.com/langchain4j/langchain4j/pull/503
• action to build and publish javadoc to pages by @LizeRaes in https://github.com/langchain4j/langchain4j/pull/504
• Flesh out RetryUtils with a policy mechanism. by @crutcher in https://github.com/langchain4j/langchain4j/pull/484
• ServiceHelper.{loadService, loadFactoryService}() by @crutcher in https://github.com/langchain4j/langchain4j/pull/485
• SystemMessage tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/486
• ImageContent tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/487
• ToolExecutionResultMessage tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/488
• Make PromptTemplateFactory.Input a FunctionalInterface. by @crutcher in https://github.com/langchain4j/langchain4j/pull/489
• LanguageModel and StreamingLanguageModel tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/491
• Moderation tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/492
• Response tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/493
• language.TokenCountEstimator tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/494
• StructuredPrompt refactor and tests. by @crutcher in https://github.com/langchain4j/langchain4j/pull/490
• Tighten coverage ratchet. by @crutcher in https://github.com/langchain4j/langchain4j/pull/483
• Unify langchang4j-core coverage to a 95% requirement. by @crutcher in https://github.com/langchain4j/langchain4j/pull/509
• added documentation link by @langchain4j in https://github.com/langchain4j/langchain4j/pull/517
• Fix all jococo javadoc warnings in langchain4j-core. by @crutcher in https://github.com/langchain4j/langchain4j/pull/510
• Default methods for ModerationModel. by @crutcher in https://github.com/langchain4j/langchain4j/pull/511
• Coverage work on InMemoryEmbeddingStore. by @crutcher in https://github.com/langchain4j/langchain4j/pull/520
• Fix reflection bug that broke tests during coverage. by @crutcher in https://github.com/langchain4j/langchain4j/pull/519
• add logging and model parameter tutorials to docu by @LizeRaes in https://github.com/langchain4j/langchain4j/pull/536
• Add IT for AWS OpenSearch using LocalStack & Testcontainers by @eddumelendez in https://github.com/langchain4j/langchain4j/pull/416
• Use the Jackson BOM to solve Jackson dependency errors by @jdubois in https://github.com/langchain4j/langchain4j/pull/523
• enable Reproducible Builds by @hboutemy in https://github.com/langchain4j/langchain4j/pull/528
• Allowing model builders to be extended and to be provided by ServiceLoaders by @edeandrea in https://github.com/langchain4j/langchain4j/pull/531
• Testing and efficiency work on HierarchicalDocumentSplitter. by @crutcher in https://github.com/langchain4j/langchain4j/pull/524
• Allow @SystemMessage to be placed on a class by @geoand in https://github.com/langchain4j/langchain4j/pull/546
• Bump com.jayway.jsonpath:json-path from 2.8.0 to 2.9.0 in /langchain4j-parent by @dependabot in https://github.com/langchain4j/langchain4j/pull/541
• tiny improvements by @langchain4j in https://github.com/langchain4j/langchain4j/pull/543
• Fix illegal group reference when the value contains $$ by @ilopezluna in https://github.com/langchain4j/langchain4j/pull/545
• Bump com.google.guava:guava from 30.1-jre to 32.0.0-jre in /langchain4j-qdrant by @dependabot in https://github.com/langchain4j/langchain4j/pull/547
• Update localstack version to 3.1.0 by @eddumelendez in https://github.com/langchain4j/langchain4j/pull/550
• Update Vertex AI embedding to allow a batch size of 250 by @glaforge in https://github.com/langchain4j/langchain4j/pull/556
• Simplify replacement in PromptTemplate (#515) by @langchain4j in https://github.com/langchain4j/langchain4j/pull/554
• Fix #563: IllegalArgumentException occurs when attempting to use AiServices with OllamaStreamingChatModel by @langchain4j in https://github.com/langchain4j/langchain4j/pull/564
• Correcting the code snippets in the docs by @sivaprasadreddy in https://github.com/langchain4j/langchain4j/pull/566
• Automate release by @langchain4j in https://github.com/langchain4j/langchain4j/pull/562

New Contributors

• @crutcher made their first contribution in https://github.com/langchain4j/langchain4j/pull/401
• @leojames made their first contribution in https://github.com/langchain4j/langchain4j/pull/358
• @amithkoujalgi made their first contribution in https://github.com/langchain4j/langchain4j/pull/458
• @gdarmont made their first contribution in https://github.com/langchain4j/langchain4j/pull/449
• @sergioa made their first contribution in https://github.com/langchain4j/langchain4j/pull/450
• @bidek made their first contribution in https://github.com/langchain4j/langchain4j/pull/462
• @mateusscheper made their first contribution in https://github.com/langchain4j/langchain4j/pull/431
• @glaforge made their first contribution in https://github.com/langchain4j/langchain4j/pull/456
• @hboutemy made their first contribution in https://github.com/langchain4j/langchain4j/pull/528
• @czelabueno made their first contribution in https://github.com/langchain4j/langchain4j/pull/514
• @Anush008 made their first contribution in https://github.com/langchain4j/langchain4j/pull/542
• @ilopezluna made their first contribution in https://github.com/langchain4j/langchain4j/pull/545
• @lane12138 made their first contribution in https://github.com/langchain4j/langchain4j/pull/499
• @sivaprasadreddy made their first contribution in https://github.com/langchain4j/langchain4j/pull/566

Full Changelog: https://github.com/langchain4j/langchain4j/compare/0.25.0...0.26.0