Language Models

2026/11/02

  1. Fast mode on Claude Opus 4.8 ends on 30 November; on Opus 5.5 it costs $8 input and $40 output
    PriceAnthropic

2026/10/19

  1. Sending Claude API traces to Datadog and other platforms with OpenTelemetry
    How to UseAnthropic
  2. OpenAI's Decisions API does not charge for output, at $0.10 per million input tokens
    PriceOpenAI

2026/10/18

  1. Creating GPT-Live voices from text for free, plus new Japanese voices Harema and Shida
    How to UseOpenAI
  2. Fast mode for Claude Opus 5.5 no longer needs an access request (at twice the standard price)
    PriceAnthropic

2026/10/13

  1. How much does speech-to-text cost per hour? Comparing the xAI and Mistral APIs
    PricexAIMistral
  2. Mistral Large 4 costs $1.36 in and $4.18 out, at half price for two weeks after launch
    PriceMistral
  3. Claude Managed Agents' web_fetch now fetches only URLs that already appear in the session
    How to UseAnthropic
  4. xAI's speech-to-text API costs $0.10 an hour in batch, and moved to 2.0 on 2 October
    PricexAI
  5. Claude Max and Team plans now include monthly API credits ($100 on Max 5x)
    PriceAnthropic
  6. GPT-6.1 Sol charges less than GPT-6 Sol for cached input
    ModelOpenAI
  7. Claude Sonnet 5.5 keeps Sonnet 5's price, and its cache reads were halved on 7 October
    ModelAnthropic
  8. Claude Haiku 5.5 is priced like GPT-6 Luna up to 100K tokens, and five times higher beyond
    PriceAnthropicOpenAI

2026/09/29

  1. Gemini 2.5 models are now limited to users who have used them before
    ModelGoogle
  2. Grok 4.7 joins xAI's model list at the same price and context as Grok 4.6
    ModelxAI
  3. Gemini 3.8 Live pricing: audio in at $0.005 a minute and audio out at $0.018
    PriceGoogle

2026/09/28

  1. Gemini 3.8 Flash TTS and Flash-Lite TTS prices double on 1 January 2027
    PriceGoogle
  2. Claude Opus 5.5 is $4 in and $20 out, and the model Anthropic now recommends first
    ModelAnthropic
  3. GPT-6 Sol and GPT-6 Luna: Luna costs a twentieth of Sol
    ModelOpenAI

2026/09/15

  1. DeepSeek V4.1 Flash takes over from V4 Flash at a lower price
    ModelDeepSeek
  2. Sakana AI's Fugu Ultra v2 and Fugu Max answer by routing work to other models
    ModelSakana AIOpenAI
  3. Cognition's SWE-2 is a coding model built on Kimi K3
    ModelCognitionMoonshot
  4. Inception's Mercury 2.5, a diffusion model at $0.75 per million output tokens
    PriceInceptionOpenAIAnthropic
  5. GPT-Live 1 bills by the minute, at $0.05, with the reasoning model on top
    PriceOpenAI

2026/09/08

  1. Meta sells the same model at two prices, and the cheap one is paid for with your prompts
    PriceMeta
  2. Grok 4.6 is the flagship, and it holds half the context of Grok 4.3
    ModelxAI
  3. Kimi K3 holds a million tokens at one flat rate
    ModelMoonshot
  4. The same Qwen model costs less from Beijing than from Singapore
    PriceAlibaba
  5. On Mistral, Large costs a third of Medium
    PriceMistral
  6. GPT-6 Astra and the three models that make up GPT-6
    ModelOpenAI
  7. GPT-6 Astra prices, and the 272K line that reprices the whole request
    PriceOpenAIAnthropic
  8. Claude Fable 5.1 takes the top of the lineup, and Fable 5 moves to legacy
    ModelAnthropic
  9. Cache reads on Fable 5.1 are a quarter of what they cost on Fable 5
    CostAnthropic

2026/09/02

  1. The current Claude lineup: 1M context, 128K output, retirement more than a year out
    ModelAnthropic
  2. SWE-bench Verified is at 97, and the top of the table is hard to read
    BenchmarkAnthropic
  3. A benchmark number means nothing without the conditions it was taken under
    BenchmarkAnthropicOpenAIGoogleDeepSeek
  4. Claude API prices, and the Sonnet 5 increase that did not happen
    PriceAnthropic
  5. OpenAI API prices: the GPT-5.6 line has long-context rates too
    PriceOpenAI
  6. Gemini API prices, and the two dates that change them
    PriceGoogle
  7. DeepSeek now charges double during peak hours
    PriceDeepSeek
  8. Perplexity Sonar ends on 27 September 2026, replaced by the Agent API
    PricePerplexity
  9. What prompt caching actually costs, and where the tenth does not hold
    CostOpenAIAnthropicGoogleDeepSeekxAIMetaMistralAlibabaMoonshotSakana AI
  10. Long context: who reprices the whole request, and who does not
    CostOpenAIAnthropicGooglexAIAlibabaMoonshotSakana AI
  11. Adding an MCP server to Claude Code, and which scope to pick
    How to UseAnthropic

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Claude Sonnet 5.5 keeps Sonnet 5's price, and its cache reads were halved on 7 October

ModelAnthropic
2026/10/13

Claude Sonnet 5.5 was released on 28 September 2026⁠[1,2]. The model id is claude-sonnet-5-5⁠[1,2].

In Anthropic's description, Opus 5.5 is for complex work that needs careful judgment, while Sonnet 5.5 is strongest at well-scoped everyday tasks, fixing bugs, and creating documents, slides and spreadsheets⁠[1].

Per million tokens it costs $2 input and $10 output, unchanged from Sonnet 5⁠[1]. Cache writes cost $2.50, and cache reads were $0.20 at launch, the same as Sonnet 5⁠[1].

On 7 October cache reads dropped to $0.10, going from 10 percent of the input price to 5 percent, the same ratio as Opus 5.5⁠[1,2]. Because cache reads make up a large share of token consumption, Anthropic estimates that the cut makes Sonnet 5.5 about 20 percent cheaper on most agentic tasks⁠[3].

Sonnet 5.5 often finishes the same work with far fewer tokens than Sonnet 5⁠[1]. In Anthropic's testing, the cost per task fell by up to 30 percent⁠[1]. Output is also generated more than 30 percent faster than on Sonnet 5⁠[1].

Terminal-Bench 4.0 measures whether a model can complete multi-step professional tasks in a command-line interface⁠[1]. Sonnet 5.5 scores 70.6 percent, up from 10.3 percent for Sonnet 5 and above the 66.4 percent of Opus 5.5 at xhigh effort⁠[1].

Anthropic adds that benchmark scores capture only one side of a model, and that Opus 5.5 remains clearly stronger at complex work requiring sustained judgment⁠[1].

The context window is 1 million tokens and one response can be up to 128K tokens, both the same as Opus 5.5⁠[4]. The training data and knowledge cutoffs are both June 2026, and retirement will not come before 28 September 2027⁠[4].

The default effort is high on the Claude Platform and medium in Claude Code and the Claude apps⁠[1].

Some code written for Sonnet 5 will not work unchanged on Sonnet 5.5⁠[2]. To turn off up-front thinking at high effort or below, set the thinking type to between_tools instead of disabled⁠[1,2].

Forcing tool use with the tool_choice types any and tool returns a 400 error⁠[2]. On the Claude API and Google Cloud, the earlier computer use tool computer_20251124 is not accepted⁠[2].

Thinking blocks from Sonnet 5.5 work only in the account that produced them or in an account linked to it⁠[1,2]. If another account sends one, the API drops the block and the request still succeeds⁠[2].

On 30 September Anthropic announced the deprecation of Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) and recommended moving to Sonnet 5.5⁠[2]. Sonnet 4.5 is scheduled to retire from the Claude API on 30 November 2026⁠[2].

Sources

  1. [1]Anthropic - Introducing Claude Sonnet 5.5
  2. [2]Anthropic - Claude Platform release notes
  3. [3]Anthropic - Introducing Claude Haiku 5.5
  4. [4]Anthropic - Models overview